On Wed, 07 Oct 2020 15:42:46 +0100, Chris Hogg wrote:

On Wed, 7 Oct 2020 15:28:23 +0100, PeterC
wrote:

On Wed, 7 Oct 2020 13:16:31 +0100, The Natural Philosopher wrote:

Brick acid turns limescale into soluble calcium sulphate

Sodium chloride, shirley.

Neither. Try calcium chloride.

Yes - sorry - I'd just read down-thread re. sodium hydroxide. BTW, HCl
doesn't 'burn' intacts skin even at about 50% (DAMHIK); H2SO4 and HNO3 do,
the latter leaving a brown stain - the other, more common type of brown
stain is less harmful!
--
Peter.
The gods will stay away
whilst religions hold sway