To determine acid sensitivity
- Apply a drop of muriatic acid (swimming pool acid) to the underside of the material. The underside won't matter if it etches and is less likely to have a sealer on it that interferes with the test.
- If the drop fizzes, the material can be acid etched.
Still picture of acid fizzing on travertine limestone
Video of acid fizzing on concrete
If your material is acid sensitive:
Chose a sealer that creates at least a little layer of gloss so there is some resistance to spilled acidic liquids.