Autochrome Latex

c.d.ewen

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holmburgers said:
YES! c.d.ewen, thanks for posting that! Isn't it incredible? It's absolutely grainless (starchless)
Click to expand...

Yes, easier to see the repro pattern than the grain. The reproduction is about 13x18cm, so that may well be the original plate size, too.

That's one of the few sharp pictures in the book.

Charley
 

holmburgers

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I agree, when you open to that page, it looks completely different than all the other photographs. That's what made me think it was a larger format, thus reducing the appearance of the starch grains relative to the image details. Since the starch grains are always the same size, the only way to get such a fine rendering would be to increase the size of the plate, perhaps. I wonder what the most commonly used size was.
 

Photo Engineer

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These materials are very flammable. The Ethyl Acetate is very volatile as well. Please take care in their use.

PE
 

Mustafa Umut Sarac

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Shaz ,

I looked to the material safety data sheets of these two materails and ethyl acetate is very harmful when you BREATHE it , All masks are NOT suitable for every chemical.
You must get expert help for each chemical mask for each chemical.
Otherwise you have a death or unhealthy baby.

Electric contacts , light bulbs , prises can start a fire. Check and be sure noone will electrify anything near to you.

Umut
 
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Photo Engineer

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Umut;

Contrary to many reports, Ethyl Acetate is not very harmful and is in fact an ingredient in many wines and flavorings. It is used to remove caffeine from coffee and tea. So, you are probably safe from most toxic effects, but not from its flammability or explosive nature.

PE
 

Mustafa Umut Sarac

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PE ,

Thank you. And I read Toluene is dangerous also. It would be good If you put your experience on to this material. And the dyes. Shaz will use the same dyes I posted at a thread. What do you know about the toxicology of Autochrome dyes and Kodachrome dyes and developers also ? Are Kodachrome stuff dangerous ? You had been advised me to start from cyan.

Thank you ,

Umut
 

paul_c5x4

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shaz said:
It's now that i need help for find the good filter when the damar will be dissolved. And where to put this filter... Everybody can give me ideas....
Click to expand...

Picking on some information from the traditional painting crowd - Wrap the damar gum crystals (powder) in a filter bag and suspend it in the solvent. Leave for several days until the gum has dissolved. Further filtration can be used if desired.

Coffee filter papers are cheap and should be sufficient to filter out all but the smallest of particles.
 

Mustafa Umut Sarac

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Shaz ,

May be wine filter is used to filter the very old wines which produced a powder at the bottom of bottle.
And I dont know but may be they add a chemical in to white wine to make it crystal clear and than filter the remainings. It could be a very fine grid filter or a filter like carbon or a textile pulp filter.

Umut
 

Photo Engineer

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Toluene is quite toxic to inhale or get on your skin. It can cause liver or kidney damage. IDK if it is a carcinogen. I would have to look it up.

A wine filter is a paper filter, for our purposes it would be fluted. We call it "fluted filter paper". It is used in wine making and chemical operations that require or can use gravity filtration as opposed to vacuum filtration. Vacuum filtration will harm wines due to the volatility of the aromatic essences present.

PE
 

nullbyte

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Hi, I'm new on APUG and just read through this amazing thread. Shaz, your attitude is amazing. I happen to know quite a bit about chemistry and have handled both toluene and ethyl acetate myself. The reason ethyl acetate is dangerous is that in its pure form it vaporizes at room temperature and it is an organic solvent (basically it's pretty bad for your brain to inhale and you will feel very dizzy after a short while, if you manage to drink some you should call an ambulance immediately). Toluene is pretty toxic as Photo Engineer says, but both are pretty easy to handle - just make sure you have proper ventilation (you might want to do the chemistry outdoors or near a open window) and use gloves, preferably nitrile gloves. They are much better for handling organic solvents than regular latex gloves.
 
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Photo Engineer

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If the work is done indoors by an open window, a breeze blowing into the room will cause problems if there is a stove pilot light, a hot light bulb or other source of ignition. This is best done outdoors.

PE
 
OP
OP

shaz

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Ok guys, i will prepare the first varnish outside with apropriate gloves, mask and glasses. And thank you PE for "fluted filter paper"...i will have a look on internet and translate this in french...I hope i will start soon now.
Thank you nullbyte .

Shaz
 
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