I use all of the above.. I do use food coloring.. and i am a cake decorator and have used paste food coloring(mostly in a pinch).. the only thing about using the paste is that its expensive.. more expense that regualr food coloring or B&B colorants. AND... they contain additives that reg old FD&C colors do not like Propylene Glycol, Hydrated Silica, Sorbitol, Glycerine, Methylcellulose, Gum, Vegetable Gum, and Sodium Bicarbonate which can affect your soap, some yellows even contain alcohol..