@kerrybeal, is PCB a brand of powders?
I have tried these Barco powder colours but not all of them seem 100% fat soluble (
https://barcobake.com/product-category/dusting-and-colouring-powder/). Some colours are great, but some don't even dissolve. The yellow was orange .... I dipped my hand under running water and the water turned yellow. I've come across the Colour Mill brand which is also vegan, just ordered myself a few to test, I'm hoping this is the answer!
https://bakersboutique.co.za/product/colour-mill-colouring-dusk/