Just spotted this discussion (I know its very old but sometimes I am slow)...lol
Reading everyone's comments I really enjoyed reliving all the trials, efforts, experimenting and research and development this type of work takes, along with the training it takes to see and break down colors. Twenty years ago no one would have believed there would be anybody interested in investing their time and talent this way, let alone making it ones full time profession for putting food on the table.
Now days restoration is in every type of commodity that has any value in it. Bottles, ceramics, jewelery, paintings etc., etc. They each all have the same long road of what to use and how to use that product according to the persons ability doing it. :) We started out with arrowheads and now have ventured into many of the different types of restoration fields I have mentioned here. One never knows where the road one starts on, leads to.
Many people ask the question..."What do we use"? In the end the answer is, "Whatever it takes", just not any set rules! Everyone seems to be on the right track for their own level of present ability. Experimenting with new products and tools is a never ending and time consuming part of this work.