Mixing Fiebing's Pro Oil Dyes Using A Scientific Method

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Might I suggest that you check out Al Stohlman's Coloring Leather; it is probably the most informative book yet when it comes to the blending of base colors to create custom hue's and it covers so much more in techniques than most other books do. It is available as a downloadable PDF through the Leathercraft Library (another Tandy outlet); I still refer to my original print version every now and then but it was the first one that I received (about 35 years ago now) and I haven't found anything else that was as helpful.

Fiebing's also sells a book that is specifically geared towards their products and may also be of some help to you.

Thanks, I will take a look at those books.

Did you see the how to make custom colors out of the basic colors chart? It gives you the exact formula for every question you have asked.

Yes but it uses acrylic dyes, not pro oil and the base colors are different (for example purple)