Question about FOMA processing kit

[Kalu]

A silly question, is the kit only for one or two 100 feet 16mm films??
http://www.wittner-kinotechnik.de/katal ... _filmm.php

[aj]

A Fomapan reversal kit is divided in portions for 300ml. 8 of these makes for 2400ml. It is single shot chemistry. Depending on your tank you can calculate the number of films.

A LOMO for 50ft needs 600ml for 1 loaded deck with S8 and 1000ml for 2 loaded decks with S8. Check using water and see when the film is fully submersed. The official instructions require considerable more fluid but these go on the safe side and assume it costs little.

[morales72]

Hi, Kalu

According to FOMA Bohemia:

http://www.foma.cz/Upload/foma/prilohy/z_set_en.pdf

I bought the kit once. You can reuse all baths except for the bleach. Although fomapan 100r bleachs great on dicromate, the kit comes with permanganate formulation. Yes, bleach will only be good for a 100ft roll or two 50ft roll.

Hope this helps,

Morales

[gianni1]

I wanna make some of the Permanganate Reversal Bleach. Am I correct that if you make up a liter of it, you dilute it 1:9 with water.. so one liter will last for nine developing runs?

My problem is I have no experience, place or materials to prepare one liter of reversal bleach using these nasty chemicals

Potassium Permanganate 50 g - fire hazard

Concentrated Sulphuric Acid 50 ml - burn hazard


Gianni 8)

[StoneBuilder]

Don't worry about Potassium Permanganate - that's fairly benign (and stains skin brown). Sulphuric Acid is fine as long as the golden rule is followed of adding it to water, rather than the other way round. A pair of goggles is probably a good idea for the dilution bit as well as a squirty bottle with strong Sodium Bicarbonate solution in to neutralise any splashes onto skin. It's the disposal part of the situation that causes problems - those toxic chemicals down the sink.

[morales72]

A strange story:

A couple of moths ago I went to a chemistry distributor here in Madrid. It's still fairly easy to get chemicals around here and at a convenient price. Don't know for how long though. The thing is I ordered sodium bicromate and the employee didn't say anything, but when I asked for the sodium permanganate he told me he wasn't sure if was able to sell me some since its comerce is strongly regulated and they have a fixed quantity to sell per year. So, naive me, I explained him that I was told that bicromate was worse than permanganate for enviroment, but he answer that dicromate was alright. He finally sold me the permangante but I ended up puzzled with this. Coming from a well reputated international chemical company, I don't know what to think anymore about enviromental statements. Anyone else experienced anything like this?

Best regards,

Morales

[christoph]

I wanna make some of the Permanganate Reversal Bleach. Am I correct that if you make up a liter of it, you dilute it 1:9 with water.. so one liter will last for nine developing runs?

dunno about the foma stuff, but generally mixed permanganate bleach holds not terribly long, but very likely a bit better in concentrated form.

My problem is I have no experience, place or materials to prepare one liter of reversal bleach using these nasty chemicals

Potassium Permanganate 50 g - fire hazard

Concentrated Sulphuric Acid 50 ml - burn hazard

jup definitely sounds like a concentrated solution.. the kodak bleach uses 2.5g/l permanganate and 15g sulphuric acid..

personally i hate to worry about concentrated acid, so i but it in battery acid strenght (around 30%) and use more (needs some calculation for exact amount)

[aj]

I don't think the oxidizing attributes differ much but the dichromate is now under restrictions because it induces cancergrowth in laboratory rats when these are fed with a considerable dosis for a year.

Just don't eat or sniff it.

The acid should worry you more. Use goggles and gloves. And don't use metal rods or tanks. It wears them out quickly

[christoph]

So, naive me, I explained him that I was told that bicromate was worse than permanganate for enviroment, but he answer that dicromate was alright.

permanganate is restricted because of possible abuse in drugs preparation and explosives and not so much because of enviromental risks (it's even possible to neutralise it yourself afaik)..

dichromate is very nasty because it's toxic and carcinogenic and stays in the food chain.

so ironically permanganate s just as hard (or harder) to get even though it's much less dangerous in common applications.
++ christph ++

[christoph]

I don't think the oxidizing attributes differ much but the dichromate is now under restrictions because it induces cancergrowth in laboratory rats when these are fed with a considerable dosis for a year.

Just don't eat or sniff it. :)

that's a rather harmless way to put it, it's also a possible culprit in causing chromium dermatitis..

so basically avoid skin contact and take a lot care when handling it in powder form. also, *never* pour it down the drain.

++ christoph ++

[lunni]

A silly question, is the kit only for one or two 100 feet 16mm films??
http://www.wittner-kinotechnik.de/katal ... _filmm.php

A while ago I got a few of these kits and I'm hopefully going to have a first go this weekend. The kit comes with 8 bags of potassium permanganate, 0.5 grams each. The leaflet that comes with the kit states that a single 16mm / 30,5 m roll requires four bags. All in all the kit has chemicals for two 16mm/30,5 rolls. But as mentioned above check your tank with water first.

[gianni1]

Thanks it's all starting to seem clearer now...

So prior to spending a weekend processsing five or ten rolls of Foma R, I'll purchase one or two Foma R Processing kits.

I'll reuse the developer chems for several batches, but not the bleach which is one shot. I'll purchase some raw potassium permanganate from from the above photo suppliers.

The local hardware store near my work supplies gallon jugs of sulfuric acid at something like 50% or 70% strength, but suggested I get smaller quantities from the janitors at my uni who use it to clean the urinals in the men's john's...

Also get a few chemical bottles from my pharmacist...

Only need distilled water for Diafine (says so on the label).

Gianni 8)

[aj]

I recommend to use the Foma set single-shot for all baths. Why risk anything with the cheap and easy baths when reusing these?

Since you are already onto mixing bleach yourself you might just aswell do the same for the clearer. Then you can compose a set to your own likening...

Play with developers, D19, D94, Diafine, Dokumol etc.
Fixer is no trouble and the second developer is of little influence and can be any one even a reused first one (not Diafine I think, that would be a waste).

Use GLASS bottles for keeping your chemistry.

[Kalu]

A silly question, is the kit only for one or two 100 feet 16mm films??
http://www.wittner-kinotechnik.de/katal ... _filmm.php

A while ago I got a few of these kits and I'm hopefully going to have a first go this weekend. The kit comes with 8 bags of potassium permanganate, 0.5 grams each. The leaflet that comes with the kit states that a single 16mm / 30,5 m roll requires four bags. All in all the kit has chemicals for two 16mm/30,5 rolls. But as mentioned above check your tank with water first.

Can you share your experiences here and/or on the finnish forum? Thanks!