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<p>[QUOTE=&quot;Kentucky, post: 2427025, member: 33176&quot;]Please get one thing straight.&nbsp; The caustic nature of a chemical can be a warning sign, and the strength of the solution is also important.&nbsp; I once saw a student burned by phenol when he put his arm on a chunk lying on a lab table.&nbsp; It ate out a hole you could put your finger in...that same chemical, phenol, is used in some cough drops, just at a very low concentration.&nbsp; That is one problem with MSDS sheets, they tell you what is there, but not the concentration. </p><p><br /></p><p>Now [USER=1892]@SuperDave[/USER] says he uses EZest, but dilutes it.&nbsp; May I submit that if MS70 contains potassium hydroxide, I really don&#039;t know the strength of the solution.&nbsp; The thiourea in EZest isn&#039;t there for the basic nature, in fact, I think the solution contains sulfuric acid.&nbsp; The action of ammonia is probably due in large part due to it being a base.[/QUOTE]</p><p><br /></p>

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