The water based colours are very concentrated - the more you put in, the stronger the colour!
You need just 2-6 drops per 100 grams or millilitres; mixing two or three primary colours gives you other colours.
These Liquid Colours are not light sensitive and do not discolour your sink or bath.
Water-Based Colours (WB) can easily keep without fading for 7 years in an airtight container; just don’t store them in direct sunlight.
They’re best stored in a dry and dark place.