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kevinaston1 · 17th Oct 2018, 10:58 pm

I have a old engineering text book; it describes immersing the file in 20 to 30% nitric acid solution for a few minutes. Remove the file and wipe the surface on a cloth stretched across a block of wood, thus leaving the acid to eat away at the base of the teeth for a few minutes before washing off with water.

At the end of the page, it is mentioned that rubber gloves should be worn when handling the acid.

Health and safety?? when I started work in the 60's, there was a shed out at the back of the main workshop where parts were sent to be case hardened using POTTASIUM CYANIDE......................

Kevin

17th Oct 2018, 10:58 pm	#25
kevinaston1 Hexode Join Date: Aug 2014 Location: Featherstone, West Yorkshire, UK. Posts: 386	Re: Don't try this at home... I have a old engineering text book; it describes immersing the file in 20 to 30% nitric acid solution for a few minutes. Remove the file and wipe the surface on a cloth stretched across a block of wood, thus leaving the acid to eat away at the base of the teeth for a few minutes before washing off with water. At the end of the page, it is mentioned that rubber gloves should be worn when handling the acid. Health and safety?? when I started work in the 60's, there was a shed out at the back of the main workshop where parts were sent to be case hardened using POTTASIUM CYANIDE...................... Kevin