Unit of Measurement question

Oulipo

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Hi,

I'm mixing up ECN2 (for 16mm film) chemistry and using the Kodak published doc: Process ECP-2D Specifications - H2409a for the recipe.

There's a unit of measurement "gL" which I don't understand.
Specifically for the Fixer: Sodium Sulfite (Anhydrous) - 2.5 gL

The really confusing thing is that all other units of measurement are in 'g' - grams (for powders) and 'mL' - milliliters (for liquids.) The gL is the only instance it seems in the whole document and we're talking about a powdered chemical here.

What is this? Is anyone able to set me straight?

Thanks




 
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Oulipo

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NedL said:
Maybe it is a typographical error and it is supposed to be grams per liter: g/L
Click to expand...

Hmmm, maybe but the measurements for all the powders in the document that read 'g' are grams per liter
 

Wayne

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It must be grams and the L is a typo. Someone familiar with the that process should be able to tell if that's a practical amount of sulfite for that kind of recipe
 
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Oulipo

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Wayne said:
It must be grams and the L is a typo. Someone familiar with the that process should be able to tell if that's a practical amount of sulfite for that kind of recipe
Click to expand...

Thanks. That was my initial thinking too but it does seem strange to come across a typo in a published Kodak document.
I did notice the the 'Alternative Process fixer' on the next page lists '2.5 g', so I guess it must be a typo after all.
 

Poisson Du Jour

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Gigalitre (!)
Not necessarily a typo as much as a reflection on the lack of standardisation in writing measuring units.
Grams/litre (liter). As g/l, G/l, g/L... no hard and fast rule for writing it, as much as such a rule would be helpful for consistency.
Even smaller is the mmol/l (millimol/litre) measurement... I don't think it is used in photographic chemistry, but certainly in medicine.
 

lantau

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Actually there are rules. Gram is a small g. Litre is a capital L. It used to be l. But when I was in my first semester as a Chemistry student they told us it had just been standardised to L now.
 

lantau

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Oulipo said:
Hi,

I'm mixing up ECN2 (for 16mm film) chemistry and using the Kodak published doc: Process ECP-2D Specifications - H2409a for the recipe.
Click to expand...

Are you trying to do ECN2 or ECP2? Which film are you using?
 

newcan1

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For the ECN-2 formulae, Google Eastman ECN-2 Module 7 and you'll find a pdf containing the correct formulae. ECP-2 is the print film; ECN-2 is the camera negative film.
 

Rudeofus

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If you look at the formulas throughout the whole document, their recipes are stated in grams and milliliters, and the spec column contains grams per liter and milliliters per liter. Since the formula column uses g and ml, I would strongly suggest that this one single instance of "gL" is a type and should mean "g". Note: even if it really meant g/L, the result would be the exact same, because the formula lists ingredients for 1L anyway.
 
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