Availability of different Liquid Emulsions.
I need to know if there are other liquid emulsions available than Liquid Light and what if any are the differences between them all. I have not used any at this point. I need to make a cost analysis and consider any differences in abilities between different emulsions before I proceed. Thanks for the help.
Maco/Cachet offered a few Liquid Emulsions, graded and VC. They may be available under other brands--I'm not sure who the original manufacturer was. Check J&C.
It is possible to make your own liquid emulsions in the darkroom in about 45 minutes total time with only 7 chemicals. The results will be between slow enlarger and contact speed and will have contrast grades of about 2 or lower. This includes hardening agents and spreading agents.
Formulas for the emulsion are posted on the net or available from participants in this or other forums.
With additional work and at least one more chemical, you can achieve up to ISO 25 and ortho sensitivity. These formulas are not posted or currently available, but I understand that they may be in the not so distant future.
Your biggest problems with the commercial and home grown emulsions alike will be adhesion to the substrate, spreading (coating uniformly) and hardening. Commercial emulsions often remain unsold on the shelf for a long time. They are not high volume items. Therefore, they may deteriorate with time. IDK, I have avoided using them.
That's a good point. I wonder how affected they are in the long term.
Originally Posted by Photo Engineer
AK making your own, I'm interested. Where to look? Google it?
Dr. Bruce Kahn (google) of RIT has posted his emulsion formula on the internet. It is a contact speed silver chloride emulsion that takes 3 ingredients and makes a very nice grade 2 image. You have to be careful with the formula, or it may give clumping and fog specks, but it is quite nice and compares favorably in tone with Multigrade IV paper at grade 2.
Do not use Knox food grade gelatin for its preparation. Make sure you get a good grade 'hard' gelatin such as sold by the Formulary. It should have a Bloom Index above about 175.
With keeping, the commercial grade emulsions could degrade and fog, and the gelatin might be attacked by bacteria or mold. IDK. I avoid them. They may be sterilzed and may keep well physically but chemically I have my doubts. In the worst case they would behave like keeping a box of paper or film on the shelf at room temperature a over long period.
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Check the "Chemistry Recipes" section here, and I think you'll find one emulsion formula.
van Huyck Photo
"Progress is only a direction, and it's often the wrong direction"
this is one GREAT book - BUY IT!!
Originally Posted by doughowk
there are many! recipies of making your own emulsion...
I have tried a few:
Liquid Light : beautiful surface!! but too difficult for me... fogs to easily..
TETENAL WORK : also great blacks. I have no clue whether you can get it in America, but here in Denamrk it is EXPENSIVE!!
FOMA: cheap!! (in appearence. it needs at least two layers of coating, so the price goes up..)
MACO: the same as FOMA. needs a lot of emulsion, so it gets a little annoying to work with.
just tried the VC. result was dissapointingly flat images, even using filter 5..
(this Could be me - needs to experiment more.)
the VERY BEST - price/workability is SE1 by Kentmere..
totall matt in surface (you might add some glycerine to make a slightly more glossy surface..)
BUT it works like a charm. one coating - easy to coat. Works like "normal" fiber based prints.
works VERY well with different toners.
and it keeps well over time.
I allways buy 5 liters at a time. It is a lot, but as I have students, it is the amount to buy.
also when buying this in 5 liters, the price goes way down..
only one warning: IF you buy (do it with some friends and split the costs) be aware, that the bottle it is sent in, is NOT light proof. OPEN ONLY in a dark room...
SILVER GELATINE and SE1 and you are getting some where..
and you can get it in the same place..(plus brushes)
The formula posted on this forum is an old Kodak formula, published for patent purposes. It was available in a pamphlet upon request.
It works just fine, but is needlessly complex compared to that of Dr. Kahn. You could go either way. Both work just fine, but the Kodak emulsion here is a bit faster IIRC and takes a lot longer to make.
the photographer's formulary sells formu-lite ( sorry about the bad spelling) ... never used it, and from what i remember it might be rebranded maco ...