Bill,
Follow the directions if it comes with some. There is nothing like it for curly maple.
I'm currently in the process of selecting parts for a flintlock fowler and will be using aquafortis for the stock.
Use a heat gun if you have one for your heat source and like Eric said it will first turn green then the true color comes out and so will the smile on your face. You can neutralize with baking soda. If your looking for a nice in the wood satin finish I would recommand a hand rubbed finish using pure tung oil. You will need to cut that back at least 50% for the first couple of coats, eight coats applied once a week will give you a finish that will make you cry with joy. For protection use a satin finish amber or brown old fashioned wax.
Sorry I have gunstock on the brain
. Disregard what I said about the tung oil and wax, forgot it's a glass backed bow.