Thanks Yvsa. That brings up another question that I have about testing hardness but I think that I am going to put it in a new post to get more attention.
Originally posted by cucharadedragon Also, on my BAS I got a beautiful staining with the vinager after only a couple of hours, but no difference in color around the sweet spot.
I had one khuk that vinegar did not reveal the differential hardening.
I decided to use -very- dilute Ferric Chloride.
This revealed the zones very clearly.
Lots of other common acids to try:
various citrus juices
phosphoric acid
oxalic acid
others
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