Anyone have a source for Ethylenediamine?

[Ian Grant]

Most people won't have scales precise enough for colour chemistry where precision and consistency is paramount. This is most critical where small volumes are being made up and is the soucre of mny inconsistencies.

My old analog pan balances weigh accurately to +/- 0.01g, my lab balances were capable of much higher precision +/- 0.00001g but at a price way outside home users.

Ian

 

[cinejerk]

I agree 100% Ian.

I just bought another scale capable of 0.01g

Maybe that will help some.

 

[Ian Grant]

I agree 100% Ian.

I just bought another scale capable of 0.01g

Maybe that will help some.

Just to put some reality to the degree of accuracy needed it's relative to the quantity and the application, when I use scales accurate to +/- 0.00001g that's with a sample weight of approx 0.2 gm and money riding on the accuracy of the results - precious metal assays.

With a B&W developer and a 0.2g (or less - one dev uses 0.12g) quantity not unusual in a litre of dev containing Phenidone or Dimezone then +/- 0.01g is becoming significant. This is one reason I make up larger quantities typically 5 litres at a time of more concentrtated solutions. We don't need the same scale accuracy for 100gms though. But it is something e need to be aware of are weights +/- 1%, or tighter. Scales that weigh to +/- 0.01g for 0.2g of a chemical are only accurate to +/- 5% and if one chemical goes one way another the opposite the effects are compounded.

Ian

 

[cinejerk]

So what exactly does ethylene diamine do in the color developer for the E6 process or VNF-1 for that matter?
I guess I should ask the same question for the benzyl alcohol too.

I'm playing around with some E6 color developer home brews that are starting to look pretty good. And none of them have ethylene diamine in them.

If I could get my VNF-1 film to look even close to what I am seeing with E6 I would be very satisfied.

I found this formula. I know it's not ethylene diamine but just wondering what part the EDTA Na4 is playing in this?

E4 color developer
cf. D. Murray, publ. in “Simplified Color Processing Formulas,” P. Dignan

Water 110F 800 ml
Sod. phosphate tribasic 40 g
Sod. hydroxide 10% solution 80 ml, as required
Benzyl alcohol 35% solution 10 ml
Citrazinic acid 1.3 g
EDTA Na4 3 g
Sod. sulfite 5 g
KI 0.2% solution 5 ml
CD-3 12 g
Water to make 1 liter
Set pH 12.0 @ 80F using Sod. hydroxide 10% solution.

Note: To make benzyl alcohol 35%
Benzyl alcohol 35 ml
Isopropyl alcohol 45 ml
Water 20 ml