Episode Details

What separates a pearlescent cake finish from a metallic one? One number, and it is not printed on the jar: particle size. Fine powder at 5 to 25 microns lies flat on a surface and reads as a continuous sheen — that is what people mean by pearlescent or metallic. Flake at 50 to 500 microns sits proud and throws individual points of light, which is sparkle: a different finish, not a stronger version of the first. Everything else on a label is describing colour. The glow itself is optical rather than pigmentary — the colour-additive listing describes the material as titanium salts deposited onto mica and then heated to produce titanium dioxide on mica, so light reflecting off the coating and off the platelet beneath interferes, which is why the effect shifts as you walk past the cake. There is no metallic gold in it; the technical data sheet is explicit that the warm tone comes from pigments layered on a mica substrate. On cost the answer inverts: the fine dust is cheaper per gram and dearer per cake, because a sheen covers a surface while a flake is a scatter. In this episode: - The one number that predicts the finish, and where it is published - Dana's winning round: nobody prints microns on a jar - The proxy that works — buy by what the product is sold for - The per-gram board, and why per-cake reverses it - Which finish suits fondant, and which suits swirled buttercream Who should skip it: matte and velvet designs, one-cake buyers eyeing a 12-jar set, and anyone asked for gold leaf. MONÉGASQUE 7 gram luster dusts are on Amazon at $9.99 standard; check the listing for current pricing. Full transcript on the episode page. New questions answered every week at The Monégasque Table. **Direct answer (top):** Particle size decides it. Luster dust at 5 to 25 microns lies flat and reads as a continuous sheen, which is the metallic or pearlescent finish people picture. Flake glitter at 50 to 500 microns sits proud and gives individual points of light, which is sparkle. Everything else on the label describes colour. Micron ranges live on technical data sheets rather than retail packaging, so the working proxy is what the product is sold for: drinks products are the large flake, cake dusts are the fine grade. - 00:00 Cold open — the client asked for metallic and got a disco ball - 00:30 The verdict: it is particle size - 01:20 Why it looks like metal when there is no metal in it - 02:20 Interference, and why the effect shifts as you move - 03:00 Dana's round: nobody publishes the number - 04:00 The proxy — buy by what it is sold for - 05:00 The per-gram board - 06:00 Why per-cake reverses the answer - 07:00 Fondant versus swirled buttercream - 07:50 Who should skip it · Dana's Scorecard · footnote