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09-30-2014, 10:41 PM #11
Oxalic acid is mostly used to clean iron stains off. In the lab you need some HCL-dilute is enough. The vinegar should give some reaction though if it's limestone. For hardness You can use a chunk of quartz if you have it to test at level 7 or some feldspar for level 6. Apatite for level 5 Fluorite for 4 and calcite for 3.
No matter how many men you kill you can't kill your successor-Emperor Nero