I would post some pics but I can't get to my computer right now. Maybe later today.
I really enjoy messing with aniline dyes on selfbows and bamboo backed bows. The possibilies are many. At times, I've completely changed the color of the bows, and at others simply used a more diluted dye to enhance the grain and natural coloring... sometimes both on the same bow... fading from dyed wood into the natural coloring... sometimes back to dyed at the tips... sometimes not.
There are a few 'tricks' involved. Methods like Eric's Scotch Brite pad mentioned above. I like that one myself and also use 0000 steel wool to take dye off the latewood while leaving it in the earlywood... which REALLY makes the grain pop out at you. I've done this on just certain parts of a bow, and over the whole thing... depends on my mood.
The best way to learn is just go for it, don't hold back, try different techniques of application, of manipulation after application, various amounts of pigment diluted in the medium, etc. Even if you have to 'sacrifice' or 'settle' on the first few bows, you'll be gaining skills and experience that will help you greatly on succeeding bows.
You can check colors and such on test pieces, but often the best place to try the various techniques is right on the bow.
By the way Eric, generally, you don't want to apply dye, then try to blend colors with an unpigmented medium... like clear alcohol... isn't that what you asked? it will just wipe 99% of it right back off... also good to know :^) You need to blend with the same cloth patches that you used to apply your base colors... 'dragging' one color into the next... sometimes rewetting them a little or a lot, sometimes getting the look you're after as the patch itself has a mix of the colors in it from the blending, sometimes getting what you need as the patches begin to dry out.
Like anything else, it just takes doin... takes practice.
I've used dyes in all three basic mediums... oil, alcohol, and water and prefer them in that order. Water raises the grain too much and alcohol flashes off faster than oil, making it just a little harder to blend colors.
The 'oil' based dyes aren't actually mixed in oil, but rather oil based solvents like turpentine, naphtha, tuluol, paint thinner, etc. I dyed a lot of bows with alcohol, but once I tried oil, I liked it better.