Genuine vs Composition Leaf: What Actually Changes
Composition leaf — also called Dutch metal or schlag — is often described to beginners as “fake gold,” which undersells what it actually is: an honest, purpose-built imitation made from a copper-zinc alloy, essentially brass, beaten out the same way genuine gold leaf is. It contains no gold whatsoever, and understanding exactly what that trade-off buys you and costs you makes it much easier to decide when it's the right material and when it isn't.
The obvious difference: cost
Composition leaf costs a small fraction of what genuine gold leaf does, because brass is vastly cheaper than gold as a raw material and composition leaf typically requires far less labor-intensive beating to produce at a workable thickness. That price gap is exactly why composition leaf exists and remains popular: it makes gilding accessible for large-scale work, practice pieces, temporary displays, and theatrical or decorative projects where the cost of genuine leaf simply wouldn't be justified. Running the same 500-square-inch project through the numbers at an illustrative genuine-leaf price against an illustrative composition-leaf price makes the scale of that gap concrete rather than abstract — composition leaf's material cost can land at well under a fifth of genuine leaf's for an identical amount of coverage, even before labor is added to either side.
The difference that actually matters over time: tarnish
Genuine gold, in any karat gilders use, does not tarnish. That's not a marketing claim — it's a basic property of gold's chemistry, and it's the entire reason gilded objects from centuries ago can still show their original color today. Composition leaf, being a copper-zinc alloy, absolutely does tarnish, developing a dull, sometimes greenish or brownish cast as the copper in it oxidizes, especially with humidity or handling. This is the single biggest practical consequence of the genuine-versus-composition choice: composition leaf needs to be sealed with a protective varnish to slow that process, and even sealed, it's generally understood as a finish that will need maintenance or replacement eventually, not a permanent one.
Silver leaf sits in an interesting middle ground here — it's a genuine precious metal, not an imitation, but silver does tarnish over time (though far more slowly and predictably than composition leaf's brass alloy), so it shares composition leaf's need for a protective seal if a bright, unweathered look is meant to last. We look at exactly which leaf types need that seal, and why, in burnishing, sealing, and why some work is left bare.
Handling differences you'll notice immediately
Composition leaf is usually beaten to a noticeably greater thickness than genuine gold leaf, and it's typically sold in larger sheets. Both differences make it considerably easier to handle: it tears less easily, tolerates a slightly less delicate touch, and often doesn't require a gilder's tip (the specialized brush used to lift genuine loose leaf by static) in quite the same way, since it's more often sold backed on a transfer tissue that makes placement simpler. For anyone new to gilding, practicing technique on composition leaf before risking genuine gold leaf is a common and sensible approach — the mistakes cost far less to make. Whichever material you're laying, if you're also brushing on a solvent-based sealant afterward, do it somewhere with real airflow — an open window and moving air, not a closed room.
Telling them apart once they're already leaf
Fresh out of the book, composition leaf and genuine gold leaf can look convincingly similar, especially to an eye that hasn't spent time comparing the two side by side. A few honest tells help once you know to look for them. Composition leaf's greater thickness makes it noticeably more opaque and slightly stiffer to handle than genuine loose leaf, which can look almost fluid in how it drapes and settles. Genuine gold leaf, held up to strong light, transmits a faint greenish glow because it's thin enough to pass some light through it; composition leaf, being thicker and a different metal entirely, doesn't do this. And over time, the tarnish question settles it decisively — a piece that's dulled, spotted, or gone slightly green or brown at the edges within months of finishing was almost certainly composition or unsealed silver, not genuine gold. A full identification walkthrough, including what to check before a piece is even gilded, is in identifying what leaf you actually have. None of these checks require special equipment — a strong light, a little patience for the tarnish test, and a willingness to compare a sample against a known-genuine reference sheet get you most of the way to a confident answer.
It's worth adding one more angle to the light-transmission check: the faint glow genuine loose leaf shows under strong light isn't just a curiosity, it's a direct, visible consequence of the same thinness that makes the material so demanding to handle in the first place, which is a useful thing to remember the first time you see it and wonder if something's wrong with the sheet. Nothing is wrong — that's simply what sufficiently thin gold does under bright light.
Price is itself a useful, if blunt, identification tool at purchase time. Genuine and composition leaf occupy such different price tiers per book that a listing calling itself “gold leaf” at a composition-level price is telling you something important even if its wording is vague or optimistic. When in doubt, a listing's price per book is often a faster and more reliable signal than its marketing copy.
Composition leaf and the outdoors don't mix well
It's worth stating plainly: composition leaf is a poor choice for exterior work, even sealed. Weather exposure accelerates the same oxidation that eventually dulls indoor composition leaf, and UV exposure and moisture cycling wear down protective varnish faster outdoors than indoors, which means an exterior composition-leaf finish needs a maintenance and refinishing cycle measured in a few years rather than decades. Genuine gold leaf's exterior use — gilded domes, outdoor lettering, weathervanes — depends entirely on gold's inertness holding up with essentially no maintenance for a very long time, and that's simply not a property composition leaf has to offer, however well it's sealed. Anyone quoting or planning exterior work should treat composition leaf as effectively off the table regardless of how attractive its lower material cost looks on paper. The one honest exception is genuinely temporary outdoor work — a display, a prop, or a seasonal installation that's expected to come down again within weeks rather than remain in place for years — where composition leaf's short practical lifespan outdoors simply doesn't have time to become a problem before the piece is retired anyway.
Silver leaf's tarnish is sometimes the point
Silver leaf's slow, predictable tarnish deserves a second look, because unlike composition leaf's tarnish — which almost nobody wants and everybody tries to prevent — a silver leaf finish is sometimes deliberately left to tone down on its own, or is chemically or physically antiqued on purpose, as part of achieving a particular aged look. That's a legitimate technique choice rather than a failure to seal properly, but it only works as a deliberate choice: an unsealed silver finish that's meant to stay bright will tarnish unevenly and unpredictably depending on handling and local humidity, which reads as neglect rather than as an intentional patina. If the goal is a bright, unweathered silver finish for the long term, sealing it properly the first time is far more reliable than hoping natural tarnish stays even and attractive on its own.
Where each one belongs
Genuine gold leaf earns its cost on anything meant to last without maintenance, anything of lasting value, or anything where authenticity matters — restoration of historic gilding, fine picture frames, religious icons, and permanent architectural or exterior work where reapplying leaf every few years isn't realistic. Composition leaf makes sense for theatrical sets and props, large decorative surfaces where the budget for genuine leaf simply isn't there, practice work while learning technique, and any project where a limited lifespan before refinishing is already expected or acceptable.
Palladium leaf deserves a mention alongside these two, since it's sometimes confused with white gold leaf: it's a genuine platinum-group precious metal with no gold content at all, chosen specifically because it doesn't tarnish and holds a cool white color indefinitely — effectively the durable, permanent alternative to white gold leaf for anyone who wants a true white finish without composition leaf's maintenance requirements.
A cost comparison worth running before you decide
Because genuine and composition leaf differ so much in price per book, the honest way to decide between them for a specific project is to actually price both out rather than assume. A large surface where composition leaf's lower cost per square foot compounds across many books can make a real budget difference, while a small, detailed piece might see less of a gap once labor and waste are factored in evenly across either material. It's also worth remembering that labor time doesn't shrink just because the material is cheaper — a heavily detailed piece takes just as long to gild carefully in composition leaf as it would in genuine leaf, so on a labor-heavy small project the material savings can matter less to the bottom line than they first appear to. We walk through a full side-by-side quote using both materials on the same job in quoting a gilding job. The Gilding Cost Calculator lets you plug in a price per book for either material against the same surface area and waste allowance, so the comparison is apples to apples rather than a guess.