ffallan,
Greetings and welcome to the Best place on the web
The Stannous Chloride is “ONLY” for testing “LIQUID SOLUTIONS” for precious metals content.
Have you read Hokes book or the Gold Refining Forum Handbook volumes 1 & 2?
They contain almost ALL the information you are asking others to tell to you.
Here is an example on the stannous chloride solution.
Page 9 of the “Gold Refining Forum Handbook”
16. SnCl2= Stannous Chloride= Used to test solutions for precious metals. Made by
dissolving metallic tin in hot muriatic acid. Loses strength when stored.
Positive color test as follows:
Purple/Black color is Gold in solution, the darker the spot the more Gold.
Yellow/Brown color is Palladium in solution, the darker the spot the more Palladium.
Light/Dark Rose color is Platinum in solution, the darker the spot the more Platinum.
I haven't seen that anyone has mentioned to you to Read, Read and then Read some more. There is a vast knowledge base here to assist you as situations arise but they also expect "US" to learn the basics first.
Hoke's book IS a vast knowledge base of information just waiting for You to learn and the Forum Handbooks are full of useful information. you can download the PDF's and print what you need to keep handy.
In Palladium's signature line he has links to these useful downloads.
Tom C.
P.S. Please don't add acids to organic material (ie the concentrates) until you know all materials and how the acids will react with them. The reactions of some organic materials can KILL YOU.