TAA i.2.12a.2.06.verso

The yell gold on which the scarlet ap occurs is 

always very yellow and bright and never tarnished. 

This may indicate a purer gold.

That different qualities of gold were used is 

indicated by the grey appearance of some which is 

almost certainly due to silver chloride

Coatings on Gold (Rathgen)
Silver Chloride formed by action of NaCl upon the Ag 

present. Removed by NH₃ or alternate use of HCl & NH₃ 

Red coating. Fe₂O₃. Due to extraneous deposits fixed 

by the AgCl. Removed by warming in HCl

(Rose) The surface colour of small particles <native> gold is 

often apparently reddened by being coated with 

translucent films of oxides of iron.