The non water based colours are not light sensitive and do not discolour your sink or bath.
Use 3-6 drops per 100ml.
Add the drops to your blend and stir.
Note:
The non water based colours are water soluble and not oil soluble.
Can easily keep without fading for 7 years in an airtight container; just don’t store them in direct sunlight, best stored in a dry and dark place.