Natural vegetable-tanned leather on a workbench, partly darkened by water during casing, with a sponge and spray bottle beside it.
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Casing Vegetable-Tanned Leather

ByPeter Joeseph 'Briefcase Maker' Kalafatis

Wet it, wait for the color, then work fast.

Casing is the old shop word for getting water into vegetable-tanned leather before you cut, stamp, carve or shape it, and getting it to exactly the right amount. Too little and the tool skates. Too much and the leather turns to wet bread under your hand. The whole craft of it lives in the gap between those two, and nobody can hand you a gauge for it.

Video: Hand Dying Natural Tanned Leather with Black, from Marcellino NY Briefcase Maker on YouTube.

I build briefcases out of thick, waxy English bridle, which is a strange place to teach casing from, and I’ll get to why. The steps below come in the order the work happens. Where a step belongs to a source and not to my bench, the source gets named, because the people who tool leather every day have argued about this for years and they deserve the credit for the arguing.

Why the leather needs water first

Dry veg-tan fights the tool. Damp veg-tan takes the mark.

A hand sponging water evenly onto the grain of vegetable-tanned leather to case it.

Tandy Leather’s guide to casing for tooling and wet forming puts the symptom plainly. Leather that is too dry “resists cutting and stamping,” and the tools fail to leave a clean impression. Weaver Leather Supply’s page on tooling, carving and dyeing veg tan makes casing step one for both stamping and carving and says it makes the surface more receptive and easier to cut.

That’s the working definition. Water softens the face enough for a stamp to sink and a swivel knife to glide, and when the leather dries again the mark stays where you put it.

It only works on the right leather. Vegetable-tanned hide is the one that holds a shape this way, which is part of why it’s the leather of saddlers and belt makers. My Leather Choices page calls vegetable tanning the oldest form of making leather, and that age shows in how it behaves. It remembers.

It also matters which part of the hide you’re casing. I cut my parts from the bend, the butt section where the fiber runs tightest, and a tight fiber takes water more evenly than a loose belly that drinks it in patches. That’s a judgment from cutting, not a lab result. Still, put a sponge to a piece of belly and a piece of bend side by side and watch which one goes blotchy first.

Getting the water in

Sponge it. Do not drown it the first time.

The sources split into two camps here, and both have real makers behind them.

The light camp wets the surface. Tandy says to dampen the face lightly with a sponge or spray bottle and to “avoid soaking the leather all at once,” because uneven absorption is the result. Weaver says the same thing in fewer words: sponge or spray, and dampen it evenly. On a leatherworker.net thread about casing, the member hidepounder goes further and says nothing is accomplished by soaking.

The heavy camp dunks. In a BladeForums thread on casing, Omega Leather Works describes soaking until the bubbles stop, or running the piece under the tap for about thirty seconds. Tandy itself submerges the leather, but for wet forming, not tooling, and only for about thirty seconds to a minute depending on thickness.

So the dunk belongs to molding. For tooling, sponging is where the agreement sits.

A couple of additives float around the forums. Hidepounder suggests a few drops of dish soap in the water. The BladeForums member leatherman uses a very mild soap solution, saddle soap for example, and warns that strong detergents are not a good thing. These are shop habits, not chemistry, and I’d try plain water before anything else so there’s one variable on the bench instead of three.

Wet the whole piece evenly, edge to edge. A dry stripe down the middle will show up later as a line where the stamp went shallow.

Waiting for the color to come back

The leather tells you. Your job is to stop looking at the clock.

A fingertip pressing a slight impression into properly cased vegetable-tanned leather.

Wet veg-tan goes dark. Then, as the water moves down into the fibers, the face lightens again. Every source agrees on this one sign.

Tandy says the surface “will start to return to its natural color” as the water soaks in, then tells you to press it with a finger or a tool. Ready is cool, firm, and takes a slight impression. Weaver calls the moment when the color is back but the leather still feels cool to the touch the “sweet spot.” Hidepounder’s version on the forum is the one I’d remember: almost back to its natural color, and cool when you touch it to your cheek.

The cheek test sounds like a joke until you try it. Fingertips are calloused and stupid. A cheek can tell damp from dry through a sheet of veg-tan in about a second.

Nobody gives a time, and that’s honest. Thickness, temper, the room, how wet you went: each one moves the clock. Tandy says a few minutes for the surface to absorb, then test, and if it still feels dry, add a little water and wait again.

This is the step where impatience costs the most. The leather looks done before it is done. You press a stamp in, water beads up around the edge of the tool, and the impression slumps by the time you lift your hand.

Working inside the window

Too wet goes mushy. Too dry goes deaf.

Once the leather is ready, it doesn’t stay ready. It dries from the face down while you work.

Tandy lays out both failures. Over-wet leather becomes mushy and impressions won’t hold their shape. Let it sit. Under-wet leather resists the tool; the fix is a little more water and another wait. For drying during the work, keep a spray bottle on the bench and re-wet lightly. On the leatherworker.net thread, TimKleffner warns that over-wetting leaves the leather spongy so the tools won’t make a good impression, and adds that at the right moisture the leather will burnish darker as the tool passes.

That darkening is a useful tell. A clean, dark, crisp line under the tool means you’re in it. A pale scratch means you’ve gone dry. A soft line that spreads means you’re still too wet.

Between those two failures, err dry. A dry piece needs a sponge and a minute. A soaked piece needs you to put the tools down and walk away, and that’s the harder thing for a pair of hands that wants to keep moving.

Holding it overnight, and the bridle problem

A plastic bag buys you time. Bridle does not care how much time you buy.

Damp vegetable-tanned leather pieces wrapped in plastic inside a wooden casing box to hold their moisture overnight.

Big pieces outlast the window. For those, Tandy describes long-term casing: wrap the damp leather in plastic, rest it for several hours or overnight, then let it air out a little before working so it isn’t too soft.

The forums argue about the fridge. In a leatherworker.net discussion of casing methods, Cyberthrasher bags his leather and refrigerates it overnight and says the cold keeps mold away. Bob Blea uses the bag and fridge too, because his projects run several days. HellfireJack built a wax-sealed pine casing box with a damp sponge instead, says the bag and fridge make the leather feel like cardboard, and keeps baking soda in a cup to fight mold. Bruce Johnson remembers old saddle shops with casing boxes, some lined with zinc, where rough-cut parts sat wrapped in blankets for a day.

Now the bridle. English bridle is the leather I build in, and it’s the wrong leather to learn casing on. American Bench Craft’s page on bridle leather describes it as infused with waxes and oils and resistant to water. My own Leather Choices page calls traditional English bridle very waxy, thick, heavy and stiff.

On a leatherworker.net thread about an English bridle tooled belt, the maker DoubleKCustomLeathercraft tried the cold method and says it made the strap “super stiff almost frozen feeling.” The lesson they took was that with the waxes and oils in bridle, cold is not what you want; heat is. They re-soaked it, left it overnight somewhere warm, and hung it to dry to the right feel. Their verdict on tooling it again was no.

That matches the Leather Care page from the other direction. Wax conditioners repel water, but water that sits can still get in and leave spots. Bridle lets water in slowly and unevenly, which is the opposite of what casing needs.

After the water leaves

Wet work takes something out. Put it back once it dries.

Leather that has been wet and dried again is not the same leather. Bob Blea notices it stiffer after drying from tooling and oils it with neatsfoot after carving. In the same thread, Cyberthrasher waits to oil until the tooling is done, so the order is part of it: finish the wet work, let it dry, then feed it.

What you feed it with is the maker’s call. I rub warmed beef tallow into finished vegetable-tanned leather, and the method on the Leather Care page holds for any conditioner: on with a clean cloth, rub briskly, let it sit, buff off the excess. Cleaners and water both pull oil out, so conditioning afterwards isn’t decoration.

Dye has to fit into this order too. I hand-dye vegetable-tanned leather on some builds, and anything that changes how the face takes water changes how it takes dye, so the sources’ warnings about blotchy, uneven absorption count double if a dye bottle is coming next.

Here’s where I have to argue against everything above. All this ritual, the sponge, the color, the cheek, the bag, sounds like settled science. It isn’t. On the BladeForums thread, Omega Leather Works says he doesn’t see a great difference in tooling or molding from casing, and Icewind says he has never cased for tooling at all. The fridge crowd and the box crowd still disagree about what cold does to the feel. The one thing every source agrees on is the color coming back and the leather feeling cool. Everything else is somebody’s bench, written down.

So you learn it the way you learn a stitch. On scrap, with wet hands, until your cheek knows before your eyes do. Then you do it on the good hide, and the good hide still surprises you, because it’s thicker in one corner than the other and nobody told the water.

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Leather Conditioner with Grass-Fed Beef Tallow and Lanolin: A leather conditioner made with grass-fed beef tallow and lanolin. See it on Amazon (affiliate link).

Tandy Leather Craftool Pro Swivel Knife: A ball-bearing swivel knife for cutting carving lines in damp leather. See it on Amazon (affiliate link).

Leather Stamps, 21 PCS Leather Stamping Tools with Rubber Hammer: A starter set of 21 stamping tools with a rubber hammer. See it on Amazon (affiliate link).

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Sources

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