Re: Re: Getting iron off rough stones?
Whink products are NOT phosphoric acid. They are a combination of either a chemical that uses fluorine compounds (a very dilute HF acid) that will attack silicates (including quartz). Some of their cleaning compounds are also "Waller solution" type cleaners (also Super Iron out). You need to read the MSDS to see what the solutions contain and also some of the product safety requirements.
From David Von Bargen - December 13, 2007 at 13:09:19