Bill, Rich.
As a young lad, getting into photography, I always wondered why fixer (Sodium
Thiosulphate) was called "hypo".
Only later did I find out that, back in the day, Sodium Thiosulphate was called
"hyposulphite of soda", or simply "hypo", for short.
In fact, Sir John Herschel discovered that this "hyposulphite of soda" would
dissolve previously insoluble silver salts (thus, making it an ideal
photographic fixer) as far back as 1819.
But it was not used for photography until Fox Talbot's Talbotypes (the first
process to "develop" a latent image) in 1841, as earlier processes yielded too
weak an image to use with "hypo", as the hypo also dissolves a wee bit of the
image.
Just so's ya know...
Glad you enjoyed the link.
David.
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