David,
Thanks, I never knew that.
My dad continued to develop b&w film into his 70s when he really didn’t need to
but did it anyway.
And my youngest son did Cibachrome and C-41 when he was in high school, in a
carefully blacked out bathroom.
So we are, or were, a “wet chemistry” family.
Bill
On Nov 2, 2016, at 11:49, David Young <dsy@xxxxxxxxxxxxxxx> wrote:
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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