Making soap guide
How do I colour melt and pour soap?
Short answer
Use colourants made for soap: mica powders, oxides, or liquid soap dyes and colour blocks. Mix mica with a few drops of rubbing alcohol before adding it, so it doesn't clump. Micas and oxides stay put between layers; liquid dyes can bleed. Skip food colouring and candle dye: they fade, stain washcloths or aren't made for skin.
| Colourant | Look | Bleeds between layers? | Best for |
|---|---|---|---|
| Mica powder | Shimmer, opaque colour | No | Creamy bases, swirls, tops |
| Oxides and pigments | Matte, solid colour | No | Strong colour in creamy bases |
| Liquid soap dye / colour blocks | See-through colour | Yes, slowly | Jewel-toned clear bars |
| Food colouring, candle dye | Fades or stains | Yes | Avoid |
Pick the base for the colour you want
The base decides how a colour comes out. In a clear base like our glycerin base, colour stays bright and see-through: think stained glass. In a white, creamy base like goat milk or shea butter, the same colour turns soft and pastel. Add more colourant for deeper shades, or switch to a clear base for bright ones.
How to mix mica without clumps
Put the mica in a small cup and add a few drops of rubbing alcohol, just enough to make a smooth paste. Stir that into the melted base at about 125°F. Start with a pinch, the amount our recipe book uses for its swirl and shimmer bars, and add more until you like the shade. For soft pastels a little goes a long way; for bold colour, keep adding.
Stop colours bleeding between layers
Liquid dyes dissolve in the soap, so over days they can creep across a layer line. For crisp stripes, colour the layers with mica or oxides, or keep dye-coloured layers apart with a clear or white layer between them.
Decorating the top
Mica brushed on top looks great but washes off in the first use. If you want it to last, mix the colour into a thin top layer, or brush the mica on and seal it under a thin pour of clear base.
Updated October 12, 2026 · By the Skin Said Yes team, soapmakers in Greece
