Thank you all for your comments. My color work is a combination of leather stains and dyes and acrylic paints. Rather than use Cova Color or something like that, I use artist acrylic paints. Golden is my favorite brand. The flames, for instance, were dyed with Eco-Flow Cranberry first (I always put a dye or stain down first, never acrylic on raw veg-tan). Then I added thin coats of Light Magenta. Then I went in with Quinacrodone Magenta and did a watery, light random pattern. Then, within that pattern, I went a bit heavier, again in a random pattern. Finally, I went with un-watered dabs of paint, which gives the intense magenta. Then I went in with Eco Flow Antique Black and blended the black into the magenta. I also put a few black dabs inside the magenta flames, to darken them up a bit and intensify the color effect.
And that is how I did the flames.
If you want to get into using more acrylic to intensify your color work, I recommend taking a few scrap pieces of leather and dyeing each one with a different stain or dye. Then take your acrylic paints and put a light coat on a small area of the dyed/stained leather. The dyes and stains will soak into the acrylic, changing and modifying its color. So these "color chips" are so you can figure out what the final result will be when you mix certain dyes/stains with different paints. I also recommend spraying each chip with leather sheen, as this can sometimes cause the dyes to create different colors in the acrylic from when they were first put down. For instance, when you put white acrylic down over Feibing's Black, it generally stays white. But add Leather Sheen and, for whatever reason, the white becomes blotchy with pinks and purples. It is really very odd. Only experimentation will show you what the final product will look like.
Also, might I add, brush-on finishes are no good for intense color jobs with lots of variation in dyes/stains/colors. At least in my experience, I have found that, especially when stains are employed, the brush-ons tend to pick up color and transfer it to other color sections, resulting in color contamination. That is why I use the spray. For those of you in California who, like me, cannot purchase the spray because of rediculous environmental laws that did nothing to curb pollution by big companies but screwed the little guy royally, contact me. I am going to Arizona to see family in October and will happily bring you back a can or two.
Hope this helps!
VM