[nicolas]

First of all HI! to you all this is my first posting in this incredible forum. My consideration and question:
We do buy Glycolic acid (CAS 79-14-1) in liquid form at 70-71% (rest is water). We would like to dilute it at 4-5 % in water (final solution) but then we'll need to have an acid to improove the etching capability onto ceramic and natural stone surfaces. What acid do you suggest? are there any specifical products that can help 5 % diluted Glycolic acid to become more egressive onto i.e. ceramic tiles?