It's just battery acid, Hue.  My father always did his own auto mechanic work and taught me how to handle it safely.  (Add concentrated acid to the water, not the other way around.) 

I still remember. 

Back before such things became unfashionable, all these lessons were a common part of home mechanic magazines.  We seem to have lost most of that knowledge over the years.  How many people do you know who have a lathe in their home?  After the war it seemed like one in ten - helped by war surplus, of course.  Now it might be one in a thousand.  It would be interesting to see a survey.

That seems very sad.

- Mike  KC4TOS

On 1/11/2024 7:48 PM, Hubert Miller wrote:
OH, i just noticed and read the attachment. Odd, strikes me, that the NBS presented a paper on plating 
baby shoes. When i was reading this and saw the words, "sulfuric acid", i decided i would not be copper
plating any shoes, altho i think it's wonderful that the process is explained. 
-Hue Miller