kodak HRP Developer

[Stephen Frizza]

has anyone here used Kodak HRP developer? was it a pre-technodol formula for high resolution developing?

 

[Trask]

I've not heard of HRP. I believe it was Photo Engineer who posted this following formula for Kodak EEA -- as he wrote below. However, there is no indication that EAA is intended to address the high contrast issues with TechPan as Technidol does:

Kodak's own EAA developer

This is a very clean working developer, never sold, but used internally for testing photographic emulsions. It is a pure surface developer and does not have any solvent effects on buried image.

Elon-------------2.5 g
Ascorbic Acid---10.0 g
Kodalk----------35.0 g
KBr--------------0.4 g
Water to 1 liter

pH 9.8

Note the use of decimals.

 

[Ian Grant]

It's for micro electronics where they use high resolution glass plates because of their dimensional stability. You can also use D19 so it's not that exotic, it's just sold to a different sector, rather than photographers.

There's been more than one developer marketed as HRP developer by Kodak, one is a simple MQ Kodalk (sodium metaborate) developer designed to be clean working and high contrast. Others are more caustinc MQ line developers, the technology of the industry would have been evolving HRP is short for High Resolution Plotter.

It's just the opposite of Technidol, they are all high contrast

Ian

 

[nworth]

I've heard of Kodak HDD - high definition developer - from about that period. I don't have the formula, but it is said to be similar to the Beutler developer.

 

[nworth]

Gerald Koch posted the formula for HDD here some time ago:

(there was a url link here which no longer exists)