What's the use of stock solution?

[Paul.]

Have to say I am with Stephanie,

Got hold of 35 liter packs of ID11 weighed out the powers for 1 liter stock mix, never not no problems. OK the purists frown but it worked for me and I would do it again without concern.

Regards Paul.

 

[dancqu]

The problem was with fresh D76 having a pH of 8.3,
at which point the hydroquinone is essentially inactive.
Over a few months the pH rises, to up to 9, activating the
hydroquinone. .... With time, the original D76 formula
changes character and becomes a hotter developer.

A hotter developer over time, that is why borax was
added; to maintain a more constant ph. Kodak's most
recent D-76 uses a borax blend which includes boric
acid for even greater ph stability. The cause of ph
instability, hydroquinone and it's oxidation.

Without the hydroquinone there is NO reason to include
borax. Leave it in or leave it out, you'll see no difference.
With 100 grams of sulfite and 2.5 grams of metol the
developer is a wastefully LOADED with sulfite 1/3
strength D-23. Dan

 

[Lee L]

Without the hydroquinone there is NO reason to include borax. Leave it in or leave it out, you'll see no difference. With 100 grams of sulfite and 2.5 grams of metol the developer is a wastefully LOADED with sulfite 1/3 strength D-23. Dan

Got it. I'll ring up Mr. Haist straightaway and tell him he doesn't know what he's doing.
:munch:
Lee

 

[dancqu]

Got it. I'll ring up Mr. Haist straightaway and tell him
he doesn't know what he's doing. Lee

Well it is possible that he was incorrect IF he indeed
did lay the increase in ph to other than hydroquinone
reaction products. I've not given G. Haist a read on
that subject. I've only second and third hand of his
coverage and A&T are known to error.

The ph increase: Quote Ryuji Suzuki: "... a development
reaction product of hydroquinone reacting with sulfite
causing the ph to rise." Your becoming hotter; the
activity of the metol as well.

I've never read of a metol/sulfite combination where
ph rise was an issue but have read many times of the
hydroquinone/sulfite ph instability. Dan