View single post by Robert
 Posted: Fri Jan 4th, 2019 15:01
Robert



Joined: Mon Apr 2nd, 2012
Location: South Lakeland, UK
Posts: 4066
Status: 
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 What finish would the acid create and what acid to use?

I do remember many years ago putting an aluminium motorcycle exhaust in caustic soda and it turned black! The owner wasn't best pleased... it took me ages to polish it back to silver colour.



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Robert.