Quote:
Originally Posted by Photo Engineer  Steve;
That 0.880 is the old Baume measurement of the concentration of a gas in water. It is about equivalent to 28% wt/wt of Ammonia gas in water. I have no idea how you would assure yourself of the right concentration but using household ammonia of 9% will require 3x more solution and end up making the emulsion more dilute. You might try that. By reducing the amount of water in some part of the formula by 2/3 the amount of ammonia (determined by trial and error) you might come up with a reasonable formulation.
I tried it with household ammonia just for kicks and it was much too dilute. I did not go on to remove water elsewhere from the formula, as I had 28% on hand and just went ahead with the real thing.
PE |
Hi PE,
thanks for the advice.
I've recieved replies now from emails I sent to both the UK suppliers I mentioned earlier and as I suspected the new regulations mean they can not legally ship .880 ammonia - and neither will anyone else be able to in the UK
I have ordered some Amminium Chloride to set up my own ammonia factory
but as you say, no way to tell how strong it is.
Maybe titrating it against an acid until pH becomes neutral or something? It is a long time since I did any chemistry - I'll have to look that one up!
I'll have a good look at my emulsion formula to see if I can leave water out elsewhere and use your suggestion of using household ammonia.
Steve