The ammonia used around 1900 was about 50% -very corrosive - the strongest normally available from a chemical supply co. is about 26% still very dangerous. Household ammonia is about 5% and while it works,after a fashion, it takes quite a while(days) and will not get as dark as the stronger solutions. Although I have used chemicals to color wood I can find no advantage,to out weigh the (known) risks and have not used any in many years. Any of these effects can be duplicated with modern finishing techniques much more safely. Give this a lot of thought before you decide to try it.
regards
Jerry |