More info and a question about keeping chems in soda bottles.

Gerald C Koch said:

You can get glass bottles coated with plastic to prevent them from shattering and creating a mess when dropped.

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Schott Duran bottles in plastic coated version.
(Maybe from other manufacturers too.)

A guy here at work suggested Nalgene bottles. They are industrial grade chem bottles and they aren't supposed to leak but I'm wondering about air specifically, there is a difference between not leaking and not letting in air.

Anyone know for sure about nalgene bottles?

Nalgene is a tradename and the company manufactures bottles from several types of plastic. However the name is also used generically for those made of polyethylene plastic. Not a good choice.

Gerald C Koch said:

The sulfur and selenium would be released as various compounds like sulfides and not as elementals.

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In practical terms what harm will this do to the likes of developer and fixer and how quickly?

Thanks

pentaxuser

pentaxuser said:

In practical terms what harm will this do to the likes of developer and fixer and how quickly?

Thanks

pentaxuser

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Sulfide ion is a powerful fogging agent. I suspect that selenide ion is the same.

Gerald C Koch said:

Nalgene is a tradename and the company manufactures bottles from several types of plastic. However the name is also used generically for those made of polyethylene plastic. Not a good choice.

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Ahh..ok. I thought it denoted some super-chemical-resistance-and-air-tightness.

Gerald C Koch said:

Unfortunately rubber contains sulfur used in its processing and in the case of red rubber goods also selenium. Not what you would want contaminating developers.

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But in the past processing tanks were made from hard rubber, the material was even explicitely advocated by Ilford.

Soft rubber was used in Agfa daylight loading tanks.

Ah, my idea of a hot water bottle may not be dead yet as AgX makes a good point. Come to think of it I bought some hard rubber trays and if soft rubber was used in Agfa daylight loading tanks then unless it was rubber which specifically excluded suphur in both of the above kinds of equipment then maybe sulphur is not a problem?

It may be that darkroom rubber is different but would it be likely that manufacturers of darkroom rubber equipment would be able to exclude rubber with sulphur in their contract with rubber goods manufacturers. I don't know enough about the manufacture of rubber goods to comment - and yes I am waiting for the inevitable comment about rubber goods

pentaxuser

Hard rubber is made differently from the flexible material. It would depend on how tightly the sulfur is bound to the latex. Red rubber goods get their color from the red selenium they contain.