I stay away from oven cleaner. No adjustment of the mix is possible. I use plain lye, cheaper and very adjustable in terms of mix concentration. First, read this, and recite: I WILL ALWAYS KEEP EYE PROTECTION ON, I WILL WEAR GLOVES, I WILL KEEP WHITE VINEGAR HANDY TO NEUTRALIZE THE BASE, LYE!!!
I have been using lye for years, to color cherry, oak and a variety of woods. Works great on osage. Don't want to buy or use lye? then mix some fireplace ashes with water, that works great. Where do you think lye soap came from?
Posted below are pics of an osage stick i was playing with and broke. So, prime chance to mess with dangerous chemicals. The first pics show the wood untreated. In others the test spot is shown next to the untreated spots. Note: the longer you leave it on, or the stronger it is, the darker your wood gets. When you like it, rinse it, and use vinegar to stop it, then rinse again. This is not a dry process. You must neutralize the chemical, no matter what you use, or it wil continue to "work".
The last pic shows where I steel-scraped off some of the old tung oil finish. Actually, that part is pretty. Leads me to think that you could oil a bow, scrape some off and then color it.
Hope that helps.......WEAR EYE PROTECTION. LYE DAMAGE TO THE CORNEAS IS PERMANANTLY BLINDING. CORNEAL TRANSPLANTS ARE THE ONLY CURE. I HAVE HAD TWO OF THEM....... WEAR EYE PROTECTION. piper