These colours are sold in their original powder version and are suitable for melt and pour and cold process soap making.
To use them we would recommend the following...
Melt & Pour soap bases: you add it directly to the melted base but you will need to stir and be sure you have no lumps. In clear bases you will probably get a speckled effect.
Alternatively try mixing it with a bit of gylcerine, again making sure you have no lumps.
Cold Process : we suggest mixing it with an oil first and getting rid of any lumps. Try Sweet Almond Oil and make a good paste before adding to the soap.
How about making up small amounts and storing them in a jar for later use.