KODALK Question.

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I know that Borax is disodium tetraborate (decahydrate) and that Kodalk is sodium metaborate.

Is Kodalk the 4-mole or the 8-mole metaborate?
 

Rudeofus

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This page claims Kodalk is the octahydrate. Check out (there was a url link here which no longer exists), too.
 

Trask

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How does one know if it is 4-mole or 8-mole? Looking at Photographer's Formulary, for example, they simply list the chem as sodium metaborate, no further information. More broadly, is there a qualitative difference between the two?
 

Rudeofus

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Photo Formulary provides an MSDS on their product page, which states that their Sodium Metaborate product is also the 8-mole version.
 
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