Here is crazy spalted/stained piece of silver maple. This is a local maple tree cut down and it spalted in my garage in Tx. I really wanted to do something special with this piece. My daughter was goading me to dye it pink or purple. In the end, I just went with a utilitarian bowl as nothing else seemed to fit. Finished with Mahoney's Walnut oil which I have not used in a long while. It says to cure it under UV lighting so I left it in the chuck and put it in my carving vice. This has 2 coats...destined for 3-4 more. Then after a couple of weeks, I will buff it out.
Here is a piece of fiddleback maple that I mounted on my vacuum chuck to try it out. Lessons learned: 1) chuck worked great 2) sanding sealer is old or I forgot to stir it well 3) dyes do not have to be applied on a vacuum chuck. They can be applied off lathe dried then remounted for lathe sanding. The specks you see in the bowl bottom (1st pic) are the dye being pulled through by the vacuum but they were blocked by the sealer so they never made it all the way thru. There is really only one way to solve this which would require removing the sanding sealer and dyeing the inside, too. Not worth my time. My daughter loved this piece in her school colors.
The Maple family of woods are a wonderful canvas for turning. It has only one drawback and that is the end grain marks. Fresh sharp tools and sand paper are my weapons.