A History of Adhesives: How Pre-historic People Learned to Make Things Stick

From Neanderthal Birch Tar to Modern Pressure-Sensitive Adhesives

Long before written language, metallurgy, agriculture or the pyramids, people had already encountered a remarkably modern engineering problem:

How do I make one material stay attached to another?

The answer may be at least 190,000 years old.

Archaeologists have identified birch-bark tar associated with Neanderthals at Campitello Quarry in Italy dating to at least about 190,000 years ago. It is currently regarded as the oldest known adhesive substance in the archaeological record.

That is remarkable not simply because Neanderthals found something sticky.

They appear to have made something sticky.

Birch bark does not conveniently ooze ready-made adhesive. Producing useful tar requires heating the bark so that organic material is transformed into a new substance. Experimental archaeology has demonstrated several ways this could be accomplished with materials and techniques available during the Stone Age.

That makes adhesive one of humanity's earliest known transformative technologies: taking a naturally occurring material and deliberately changing it into another material possessing useful properties.

Long before there were chemists, somebody was doing chemistry.

The Stone Age Adhesive Engineer

Imagine the problem.

A sharp stone blade is useful.

A wooden shaft is useful.

Attach one securely to the other and suddenly the combination can become something neither component could be alone: a spear, knife, scraper or other composite tool.

This process is called hafting, and it represents an enormous technological step.

But tying the pieces together isn't always sufficient. Movement between the stone and shaft can loosen the tool. Adhesive helps stabilize the connection.

Neanderthals used more than one solution. Archaeologists have identified stone tools bearing birch tar, pine resin and bitumen. Evidence also exists for pine resin mixed with beeswax and bitumen associated with mineral materials such as quartz and gypsum.

That introduces something surprisingly sophisticated:

Adhesive formulation.

These weren't necessarily standardized “recipes” in the modern sense. We should be careful not to project a laboratory onto a Paleolithic campsite.

Nevertheless, prehistoric people discovered that adhesive materials could be selected, processed and sometimes combined.

Someone had to notice differences.

One substance was too brittle.

Another flowed too easily.

One worked better warm.

Another held differently after cooling.

Eventually practical experience accumulated.

Nobody was measuring viscosity, tack, peel strength or cohesion.

But somebody was observing them.

Was Prehistoric Tar Like Modern Tape Adhesive?

Not really—and the difference is important.

Birch tar was considerably closer in behavior to what we might now recognize as a thermoplastic or hot-melt-type bonding material than to a modern pressure-sensitive adhesive.

Warm it, and it becomes softer and easier to manipulate.

Apply it.

Allow it to cool, and it becomes considerably firmer.

Experimental work shows that prehistoric birch tar could vary substantially in physical properties depending on how it was produced. Different production techniques yield materials with different adhesive performance.

Modern hair-system tape behaves very differently.

Its adhesive is deliberately designed to remain soft and viscoelastic. It must flow enough under pressure to establish intimate contact with a surface while retaining enough internal strength to resist simply flowing apart.

That deceptively simple difference represents tens of thousands of years of adhesive evolution.

Early adhesive:

Get sticky → apply → become firm.

Modern pressure-sensitive adhesive:

Remain sticky → remain soft → yet somehow remain structurally useful.

That is a much harder trick.

But How Did They Get It Off?

Here our archaeological evidence becomes much thinner.

We know surprisingly much about some prehistoric adhesive materials. We do not currently possess comparable evidence demonstrating that Neanderthals manufactured a dedicated adhesive remover.

Heat almost certainly mattered because heating changes the workability of tar. Reworking, scraping and mechanical separation would also have been possible.

What we should not do is turn chemical plausibility into archaeological fact.

Animal fats, oils, hides and other materials were available to prehistoric people and could conceivably have helped clean certain sticky substances. But availability does not demonstrate intentional use as an adhesive remover.

So, despite the temptation, there is currently no archaeological justification for:

Neanderthal SAS Remover — Ibex Formula™.

Some mysteries must remain mysteries.

Civilization Gets Sticky

As societies became more complex, so did the things they wanted to join.

Adhesives ceased being principally a means of attaching stone to wood. They found uses in furniture, decorative objects, construction, art, containers, weapons and eventually books and musical instruments.

Natural adhesive materials were abundant:

plant gums, resins, pitches, bitumen, starches, waxes and animal-derived glues.

Different civilizations developed expertise around the materials available to them.

And one family of adhesives became extraordinarily important:

Animal glue.

Animal glue is fundamentally collagen chemistry. Skin, bones, tendons and other collagen-rich tissues can be processed in water to produce a proteinaceous adhesive. The Getty Conservation Institute describes animal glue as historically useful not merely for joining materials, but also for sizing wood, gilding and binding pigments in paintings.

Animal and fish glues eventually became some of history's most widely used binding materials, appearing across Egyptian, Asian and European artistic traditions.

Suddenly glue wasn't merely holding a tool together.

It could be helping create civilization's furniture, paintings, manuscripts and decorative arts.

An Important Discovery: Adhesion Is About the Surface

Ancient craftsmen learned something else that sounds remarkably familiar to modern adhesive engineers:

The surface matters.

Furniture makers did not need a modern understanding of surface energy to recognize that the condition and preparation of the materials being joined could affect the bond.

That practical discovery survives throughout traditional craftsmanship.

And it anticipates something we still tell hair-system wearers today:

An excellent adhesive cannot perform properly if it cannot establish proper contact with the surface.

Three thousand years may change the chemistry.

It doesn't necessarily change the problem.

Glue Becomes an Industry

For most of history, adhesive manufacturing depended heavily upon natural materials.

That imposed limitations.

A tree produces whatever resin it produces.

An animal provides collagen with certain inherent characteristics.

A particular pitch behaves the way its chemistry dictates.

People could process and modify those materials, but nature still provided the starting architecture.

Industrial chemistry gradually changed that relationship.

Instead of merely asking:

“What sticky materials can nature give us?”

chemists increasingly began asking:

“What properties do we want?”

That question eventually transformed adhesives.

Consistency could improve.

Formulations could be optimized.

Materials could be manufactured at industrial scale.

And eventually the adhesive itself could be engineered for a particular job.

Then Adhesive Met Skin

This is where the family history becomes particularly relevant to True Tape.

In the nineteenth century, rubber-based adhesive plasters emerged for medical and surgical applications. These early systems helped establish the lineage that eventually developed into modern pressure-sensitive adhesive tapes.

And skin created a completely different engineering problem.

A wooden board does not perspire.

A piece of metal does not produce sebum.

Glass does not shed cells.

Human skin does all of those things.

It also bends, stretches, changes temperature and varies tremendously from one person to another.

Suddenly the question wasn't merely:

Can we make this stick?

It became:

Can we make this stick to a living surface?

And eventually:

Can we make it stick reliably without making its eventual removal unnecessarily destructive?

The history of adhesives had acquired a new problem.

The Pressure-Sensitive Revolution

Traditional adhesives frequently depend upon some form of transformation.

A hot adhesive cools.

A water-based glue dries.

A solvent evaporates.

A reactive adhesive cures.

Pressure-sensitive adhesives are different.

A PSA is designed to form a bond simply through contact and pressure without needing to undergo that kind of hardening process.

That requires an extraordinary balancing act.

The adhesive must be soft enough to wet out the surface.

But it must possess enough cohesive strength to hold itself together.

It needs tack.

It needs resistance to peel.

It needs resistance to shear.

And those properties are not interchangeable.

An adhesive can feel extraordinarily sticky and still perform poorly under sustained load.

Conversely, a formulation with tremendous internal strength may not wet a surface sufficiently to produce a useful bond.

The great achievement of pressure-sensitive adhesive chemistry isn't merely making something sticky.

It is controlling stickiness.

1925: A Frustrated Automobile Painter Changes Adhesive History

One of the best-known chapters begins in an automobile body shop.

Two-tone automobile finishes had become fashionable, but painters had difficulty producing clean boundaries between colors. Existing masking methods could perform poorly.

A young 3M employee named Richard Drew noticed the problem.

His work led to the introduction of masking tape in 1925.

Five years later, in 1930, Drew's work led to another enormously influential product: transparent Scotch cellophane tape.

Suddenly pressure-sensitive tape wasn't an obscure industrial curiosity.

It was becoming an everyday technology.

Today we barely notice it.

We seal packages with it.

Label products with it.

Protect painted surfaces with it.

Mount objects with it.

Dress wounds with it.

Attach sensors with it.

And, of course, attach hair systems with it.

The technology has become so commonplace that its sophistication is easy to overlook.

From Natural Rubber to Engineered Polymers

The twentieth century brought another enormous transition.

Synthetic polymer chemistry gave adhesive scientists increasingly powerful control over the molecular structure of adhesive materials.

Rubber-based pressure-sensitive adhesives became enormously important.

Then acrylic chemistry opened another major family of possibilities.

Modern acrylic PSAs can be formulated for combinations of characteristics including adhesion, cohesion, aging resistance, temperature performance and environmental durability.

The result is not one universal “acrylic adhesive.”

It is an enormous design space.

Change the polymer architecture.

Change molecular weight.

Change tackification.

Change crosslinking.

Change coating thickness.

Change the carrier.

Change the surface.

And adhesive performance changes with them.

This explains something consumers understandably find confusing:

Two pieces of tape can look almost identical and behave completely differently.

The important technology may be nearly invisible.

Adhesion Learns to Live With People

Modern skin-contact adhesives represent one of the more demanding branches of adhesive technology.

The bond must tolerate some combination of:

heat, perspiration, oil, water, movement, flexing, pressure, time and biological variation.

Yet maximum adhesion is not necessarily the goal.

Imagine an adhesive possessing tremendous bond strength that could only be removed by damaging the skin or destroying the attached device.

Technically impressive?

Perhaps.

Useful?

Not necessarily.

For many skin-contact applications, controlled removability is part of successful adhesion.

That brings us back to the second question that has followed adhesive technology throughout history:

But How Do We Get It Off?

For some traditional glues, water and heat can soften the bond.

For some thermoplastic materials, heat permits reworking.

For some modern adhesives, compatible solvents can swell or soften the adhesive.

For others, mechanical peel technique becomes important.

And with modern skin-contact systems, removal has become an engineering discipline of its own.

The objective isn't simply:

Destroy the bond.

It is:

Release the bond while protecting the materials on either side of it as much as practical.

For a hair system, those materials happen to include human skin and an expensive hair-replacement system.

That makes removal rather important.

From Stone Tools to Hair Systems

Nearly 200,000 years separate the earliest known Neanderthal birch-tar adhesives from today's engineered pressure-sensitive tapes.

The materials have changed almost beyond recognition.

The chemistry has changed.

The manufacturing has changed.

The surfaces have changed.

And the expectations have changed.

Yet the first adhesive maker would probably recognize the fundamental problem immediately:

Make these two things stay together.

Modern adhesive science has simply added several more difficult questions:

How strongly?

For how long?

Under what conditions?

What happens when heat, water, oil or movement enter the equation?

And perhaps the question that most clearly distinguishes modern adhesive engineering from that ancient lump of birch tar:

What should happen when we want the two things apart again?

For thousands of generations, People have been learning how to make things stick.

Modern pressure-sensitive adhesive technology is, in many ways, the science of deciding exactly how they should stick—and how they should eventually let go.

And somewhere, we suspect, a Neanderthal with birch tar stuck to both hands would have appreciated that last development enormously.

Sources & Further Reading

Kozowyk, P.R.B., Baron, L.I. & Langejans, G.H.J. Identifying Palaeolithic birch tar production techniques: challenges from an experimental biomolecular approach. Scientific Reports, 2023. Documents birch tar as the oldest known adhesive substance, dating to at least approximately 190,000 years ago.

Kozowyk, P.R.B. et al. Experimental methods for the Palaeolithic dry distillation of birch bark: implications for the origin and development of Neandertal adhesive technology. Scientific Reports, 2017. Experimental investigation of Stone Age-compatible birch-tar production.

Schmidt et al. / Scientific Reports. Research on Mousterian tools and adhesive residues documenting birch tar, pine resin, beeswax and bitumen-based adhesive technologies among Neanderthal populations.

Getty Conservation Institute. Mummy Portraits of Roman Egypt and conservation reference materials concerning animal glue, plant gums, waxes and historical binding media.

3M. Corporate historical archive documenting Richard Drew's development of masking tape in 1925 and Scotch cellophane tape in 1930.

Related True Tape Knowledge Base Articles

Why Does Surface Preparation Matter So Much for Hair-System Adhesives?
The modern science behind an ancient lesson: the surface is part of the bond.

Why Do Hair-System Adhesives Get Stronger After Application?
How wet-out, pressure, time and temperature influence bond development.

Why Can Hair-System Tape Feel Extremely Sticky but Still Have Poor Long-Term Hold?
Understanding tack, peel and shear.

Why Do Some Hair-System Adhesives Turn Gooey Over Time?
What heat, oils, wear time and adhesive chemistry can do to a PSA.

How Do Adhesive Removers Work?
The other half of adhesive science: getting things apart.

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Explore 190,000 years of adhesive history—from Neanderthal birch tar and ancient animal glues to pressure-sensitive tape, acrylic adhesives and modern hair-system bonding.