[BBC-Micro] Reversing the Tube ULA (destructively)
pete at dunnington.plus.com
Thu Oct 28 21:21:01 BST 2010
Pete Turnbull wrote:
> Nor will battery acid, which is not especially concentrated sulphuric acid.
Well, for your edification and delight, I tried an experiment a little
earlier this evening. A small amount of concentrated sulphuric acid on
the top of an IC had no visible effect. I also tried conc nitric (not
the same as fuming nitric) and conc hydrochloric, and for good measure
also a mixture of nitric and sulphuric (that's what you use to make
guncotton and nitroglycerine) and /aqua regia/ (the 1:3 mixture of conc
nitric and hydrochloric acids that is almost the only acid to dissolve
gold). None of them made the slightest impression on an IC package at
room temperature. The leads, yes. The package, no.
Battery acid, btw, is about 30% sulphuric acid in water; commercial
grade conc sulphuric, which is what I used, is about 95%.
Pete Peter Turnbull
University of York
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