These are cosmetic colours used for soap making and bath bomb making. It is supplied in a concentrated form and we recommend you test a small quantity first to achieve the colour required. If you are using this in soap please be aware the colour will look different in clear and opaque bases. If you are using them with bath salts, please test a small quantity first as the resultant colour may not be as expected. 1ltr bottle is a screw top which does not have a dropper. Each colour has the following specifications: Pink – CI 45430 Yellow – CI 19140 FD&C Yellow 5 Orange – CI 19140 / CI 14720 D&C Orange 4 Red – CI 14720 Carmoisine Red Green – CI 42090 / CI 19140 Blue – CI 42090 FD&C Blue #1 We cannot guarantee these colours will work in cold process soap making.