ghenson wrote: ↑
Thu Mar 14, 2019 11:16 pm
I will check in to that. Have not heard of it.
I have some garnet shellac that I’m hoping will darken the light areas
Potassium dichromate, or bichromate (yes, it's toxic) darkens and gives mahogany a lovely red/brown hue. I make a 10% solution. Purchased from Woodfinishing Enterprises.
The glue line is another matter. Iodine dyes carbohydrates blue/black. For your purpose it may be too dark and stand out more.
And the polyurethane glue probably won't do the same thing as aliphitic resin glue. Maybe some colored felt tip marker. Or if there is an indentation it could be filled with something as @khs suggests. I've mixed fine sanding dust with slow acting CA glue as a fill with good results.
Just a thought, but you might call Woodfinishing Enterprises and ask about dying polyureathane glue.