Kodak D-76 Question.

[Keith Tapscott.]

Does anyone know when Kodak D-76 was first introduced?
Some of the information I have searched says 1926 and other sources say 1927.
So when is the actual centenary of D-76?

 

[Ian Grant]

The answer is it came from Capstaff's 1926 research, and was first published in 1927.

Ian

 

[RalphLambrecht]

The answer is it came from Capstaff's 1926 research, and was first published in 1927.

Ian

Is this younger or older than Agfa Rodinal?

 

[Ian Grant]

Rodinal is much older Paramidophenol was patented in 1891.

Rodinal is the second concentrated solution.

Ian

 

[gbroadbridge]

Many developments back then.

 

[Ian Grant]

D76 and Rodinal have one thing in common, both were made by other manufacturers.

In modern terminology we'd call D76 "Open Source". In the late 1920s the Cine industry needed a standard, replenishable, developer, so Kodak made the formula public. It was manufacture by many other companies around the world, Ilford ID-11, Defender 6, Foma FV3, Forte FD20, Foton N12, May & Baker 320, also Agfa 19 but this had a little Bromide in the developer as a starter.

Rodinal clones were made by ilford - Certinal (1907-1960s), Johnsons -Azol, even Kodak Ltd Kondinol, never sold or made in the US.

Kodinol came from G.E.K. Mees work in 1909 when he was at Wratten & Wainwright. Somewhere I have a paper he wrote at the time.

Ian

 

[Keith Tapscott.]

Does anyone know when Kodak D-76 was first introduced?
Some of the information I have searched says 1926 and other sources say 1927.
So when is the actual centenary of D-76?

Thanks Ian.
I noticed on your website that the formula for Agfa 19R replenisher is less concentrated than the D-76R/ID11R replenisher.