for chestnut colour ( bear with me, I'll write it out in the original text from a book I have printed in Spanish and I'll try to translate the best I can)
Castaño- Se sumerge el objecto en azufrefundido mexclado con negro de humo, o en algún liquido que contenga flor de azufre mexclado con negro de humo. Se escurre y se seca el objecto, que se queda bronceado a prueba de ácidos, y que puede bruñirse, tomandoel aspecto de bronce oxidado, a causa, probablemente, de la formación de una especia de pirita caracterizada por sus hermosas reflejos metálicos y por su resistencia a los agentes químicos.
chestnut- submerge the object in molten sulfur mixed with "a class of ink made from tar ( talk to someone who does printing they might be able to help)", or some type of liquid which contains "oxidized sulfur?" mixed with "black from smoke". Drian and dry the object, that stays a bronze colourthat is acid proof and can be burnished, taking an aspect of old bronze caused, probably by a type of pyrite characterized for the lovely metalic reflectiones and chemical resistance.
I've never tried this, but if you do make sure you are in a well ventillated area and you take a close look at what are the dangers of working with these chemicals. Maybe somebody can corrct this translation if it is in anyway incorrect.
Saludos Thomas.
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