Eye-bleeding enough for you? Homestead Dry Dyes - Rockler Woodworking Tools http://www.rockler.com/transtintreg-dyes https://www.woodcraft.com/search?utf8=✓&q=dye&button=search (not really related) I was just looking at Forestry Suppliers and saw a fascinating product, though I have no idea if it's color-stable - made for looking at wood core samples, and required 95% ethanol and 50% hydrochloric acid (as well as the stuff they are actually selling) but it's supposed to specifically dye the growth rings, which could be an interesting effect if it lasted...
Ha , no those are the usual suspects but Thank you . I'm thinking something in Neon chartreuse I like your idea maybe it can be injected and vacuumed through or whatever process would pull it into the wood .