Edges That Last: The Part Everyone Sees and Nobody Plans For

**Start square.** If the edge is not straight and perpendicular, no amount of burnishing fixes it. Sand along the edge with a block — 220 grit, then 400 — until it is flat and the two faces meet it at right angles. On a glued and stitched assembly, sand the two layers down together so they become one edge. A step between layers will be visible for ever. **Then bevel.** An edge beveller is a small gouge that shaves a consistent chamfer off the corner. Run it along both the grain side and the flesh side, in one smooth pull, with the tool held at a steady angle. Bevellers come in sizes — a #1 for thin leather up to about 4 oz, #2 for 5 to 7 oz, #3 and up for heavy. Too large a beveller on thin leather removes most of the edge; too small on thick leather leaves a corner. The bevel does two things: it rounds the edge so it takes a burnish, and it removes the sharp corner that would otherwise scuff pale and ragged in a month's use.

Burnishing works because vegetable-tanned leather is collagen fibre that can be wetted, compressed and dried in a new shape. Friction supplies heat, the heat drives out the water, and the fibres set as a hard smooth layer. **Wet the edge only.** A damp finger, a cotton bud, a sponge. Damp, not soaked — water spreading onto the grain side leaves a permanent mark. **Rub hard and fast** with a burnisher: a slicker of hardwood or bone with grooves of different sizes, an agate, a piece of canvas, or a wooden dowel in a drill. Back and forth along the edge, with real pressure. **The edge tells you when it is done.** It goes from fuzzy and matt to smooth and glossy, and it darkens. It should feel hard and slightly warm. **Repeat.** Two or three cycles of wet, burnish, let dry beat one long session. Each one sets the fibres a little harder. **Chrome-tanned leather will not do this.** The tannage does not set with water and heat, so its edges are finished with paint instead — several thin coats of edge paint, sanded between. That is why most modern bags have a painted edge and a saddler's belt has a burnished one.

**Water alone** works, and on good firm leather it is enough. It is also reversible: a water-burnished edge that gets soaked will lift again. **Gum tragacanth** is the traditional edge dressing — a plant gum that lays the fibres down and holds them while they set. Brush a thin coat on, let it soak in, burnish while damp. It gives a harder, more durable edge than water and is still breathable. **Beeswax or saddle soap** rubbed into the edge before the final burnish gives the highest gloss and the best water resistance. The friction melts the wax into the fibres. This is the finish on a good belt. **Edge paint** is a flexible acrylic that sits on top rather than soaking in. Necessary on chrome tan, optional on vegetable tan, and the usual choice when the edge must be a colour the leather is not. Order matters: **dye first, then burnish.** Dye will not penetrate a burnished edge, so an edge burnished before dyeing stays pale. This is the commonest order-of-operations mistake after trying to punch holes in a finished piece.

Every edge fault has one cause, and they are worth knowing because the fix is usually to go back a step rather than to burnish harder. **Fuzzy and will not shine.** Either the leather is not vegetable tanned, or the edge was too dry, or there was not enough friction. Try more water and more speed first. **Shiny in patches.** Uneven pressure, or the edge was not sanded flat before starting. Sand it back and begin again. **Dark spots spreading onto the grain.** Too much water. It will mostly dry out on vegetable tan and it may not go entirely. **A visible step between two glued layers.** They were not sanded together. Sand them as one edge before bevelling. **A ragged edge that will not sand true.** The original cut was bevelled — the knife was leaning. Nothing fixes that except cutting the piece narrower, which is why the cutting rung insists on a vertical blade. **Cracked after a few months.** Over-burnished and dried too hard, with no oil in the leather. A light dressing of oil before the final burnish prevents it.