I like to take my colloidal gold by making hot tea out of it. It occurred to me that no one probably tested the colloidal gold while hot to see if the stabilizing effect still worked at temperatures that melt gelatin.
I took a 2 ounce sample near boiling, and added salt and HCL to find out. It held up perfectly. It was still ruby red after 24 hours, so it looks like the gelatin stabilizer is not temperature dependent once applied.