I Love Angelus dye and I to have the choklad at home. There is a few things with using it...
First make sure you have a good container of reduser (dentures alcohol works too), I know just a few colors that you can use just out of the bottle without diluting it first (red, yellow+???).
All Angelus dyes are very pigment strong and most of them need to be deluted (which means they last longer=very economical). Ontop of that differnt hides takes the dye differntly, ontop you can also have different parts of the hide take the dye differently so Always try out an example first. I suspect this goes with all good quallity dyes nevermind the brand.
If you use something else than recomended as a cleaner I would always make a sample piece first. Angelus have their own cleaner too.
Good luck//Tina