Matha Patti traditional...
In the 19th century in Greece the silver craftsmen to manufacture 'inferior' jewelry they distorted silver with a metal alloy, the agiari. That was copper and brass. Therefore, in order to whiten the 'dirty' and non-shiny effect of this mixture they used arsenic. So the jewelry that was made in this way are called ‘farmakera’ which means poisonous.
Farmakero Antique Greek Bracelet from the 19th century