Formula #47: Kodak Research Lab

Any errors or omissions you come across in the Darkroom Cookbook.
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fyrkrans
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Formula #47: Kodak Research Lab

Post by fyrkrans » Fri Nov 24, 2017 3:31 am

Browsing through the book I stumbled upon the Kodak Research Lab formula on page 255. There it says (among other things) *Sodium hydroxide, 4.0g, however there's no footnote that corresponds to that asterisk. I'm not sure whether the asterisk shouldn't be there in the first place or a footnote is missing.

PS: It's the same in the third edition, where that formula is #43 (page 228).

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sanchell
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Re: Formula #47: Kodak Research Lab

Post by sanchell » Mon Dec 18, 2017 11:56 am

OOPS! The footnote should read:

Caution: Dissolve the sodium hydroxide in a small volume of water in a separate container before adding it to the solution of the other constituents.
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Re: Formula #47: Kodak Research Lab

Post by joglar » Thu Dec 28, 2017 2:48 am

Just a "trick": to dissolve sodium hydroxide it is easier and faster if you place the beaker (or the container) in an ice bath. If you have to dissolve a big amount of sodium hydroxide you can even place some ice inside the beaker and adjust later to the final volume required.

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sanchell
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Re: Formula #47: Kodak Research Lab

Post by sanchell » Thu Dec 28, 2017 2:06 pm

Great tip, Jesús, Thank you.
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fyrkrans
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Re: Formula #47: Kodak Research Lab

Post by fyrkrans » Mon Mar 26, 2018 5:26 am

sanchell wrote:
Mon Dec 18, 2017 11:56 am
OOPS! The footnote should read:

Caution: Dissolve the sodium hydroxide in a small volume of water in a separate container before adding it to the solution of the other constituents.
Ah, right. I actually saw that note in a couple of other places, but failed to make the connection. Thanks for the clarification!

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