Liquid paper developers that keep well

[wogster]

I use protective gas which effectively prevents oxidation. Gourmet (wine?) shops sell these gases for half empty wine bottles (solitary drinkers exist), Tetenal (Germany) makes product -"Protectan", if my memory serves me right, specially for photographic purposes or you can use plain butane gas as used for filling lighters etc. All are heavier than air.

Using butane is extremely dangerous, not only is it a fire hazard, but the chances of having a bottle of chemistry explode is quite high, getting embedded with plastic shrapnel is bad, having that shrapnel coated in potentially toxic liquid, could be deadly.

 

[Nicholas Lindan]

ansco 130 ... can be filtered though a coffee filter when they get a layer of crud in the bottom of the storage bottle

I find a 1/4 tsp EDTA / qt water before adding chemicals keeps crud from forming. Calgon/Hexametaphosphate will do the same. The Calgon 'wash-aid' sold in supermarkets seems to be something else entirely and stinks to high heaven.

 

[Nicholas Lindan]

I use protective gas

'Dust-off' gas works as well as any. Costco sells 4-packs of large Dust-off cans for pretty cheap. For dusting I first use a brush and then blow off the loosened dust.

 

[Nicholas Lindan]

chucking some dry ice in the liquid

Will produce carbonic acid. CO2 isn't really very inert.

The gas capacity of water goes up as it gets colder.

 

[Jojje]

I checked my Tetenal "Protectan Antioxidant Gas" bottle and the label says it contains 20-40% butane and 60%propane. And "Extrtemely flammable". But you are hopefully not working by candle light in your dark room..

 

[erikg]

Sprint Systems, an Apug sponsor, makes a liquid print developer that holds up pretty well, I've used it for years. I also would req. ansco 130, as many others have, good stuff.

 

[Martin Aislabie]

I checked my Tetenal "Protectan Antioxidant Gas" bottle and the label says it contains 20-40% butane and 60%propane. And "Extrtemely flammable". But you are hopefully not working by candle light in your dark room..

I have never bothered looking, but the stuff works really, really well.

Doesn't seem to have an odour either

Martin

 

[Bob-D659]

That's because neither gas has much if any natural odor, ethyl mercaptan is added to make it stink, same with natural gas.