Refining gold from gold nutrient solution

[accudoc1]

I am trying to pull gold out of old bottles of aqueous colliodal gold suspension. The formula contained
Colliodal water maltodextrin potassium citrate1/10 of 1 % sodium benzoate. 15mg of gold per 1/2 oz. I had 160 oz of the liquid. I boiled it all down and burned off the carbon with a hot plate and map gas. Attached is what i left. The question is what to do next.

 

[Topher_osAUrus]

Dissolve a small sample in AR, or HCl and bleach. Test with stannous.

-use small small small additions of oxidizer in your dissolving procedure, that way you dont have to denoxx before testing with stannous.

You can also use a crystal of copperas to test the solution instead of stannous chloride

 

[accudoc1]

Thanks