Quote Originally Posted by Michael Mutmansky

It's a witch's brew mostly. For the sepia brown look, many people use a lot of burnt umber, but normally, there are other colors in there as well in smaller amounts.

Actually, I've found that BU looks very different from different paint manufacturers, so it does depend somewhat on the paint you choose to use.

Colors I use a good bit are:
burnt umber
sepia brown
ivory black
windsor blue
indian yellow

There's many others, and depending on the manufacturer, they may have different names and slightly different effects.

The process of making a combination gum bichromate and palladium print is iterative, and sometimes when I'm trying out new colors, it doesn't work out, and the print goes into the circular file.

My prints typically have two or three gum layers over the palladium base print. The darker ones often have four layers of gum, and lighter ones may only have one.

Thanks Michael,

For me working with gum has been at times quite magical and at others very discouraging, but I think the best way to learn how to print with gum is to just do it rather than read about it.

I use M. Graham pigments and for gum overs I've been working with:

Raw Sienna
Burnt Sienna
Burnt Umber
Ivory Black
Azo Yellow
New Gamboge

Since I work with very thin layers of gum I've never been quite happy with one layer of gum as I perfer a stronger color rendering. And yes I've had a lot of failures but I just file them away.

I'm also thinking of trying Quinacridone Rose or Violet in a mix for an effect in the darker tones. There are just too many choices.