Ferric - Silver & heated magnetic stirrers?

[MurrayMinchin]

Toying with the idea of trying Argyrotype's and noticed where Mike Ware says, "Add 7 g of powdered silver(I) oxide to the hot solution (1) in small amounts with vigorous stirring until all is dissolved. (This may take up to an hour...) here: https://www.mikeware.co.uk/downloads/ArgyroWork.pdf

I've also read where stirring should be done with a glass rod in a glass vessel.

Do you think a plastic encapsulated magnet in a heated magnetic stirrer would be okay to use? Can't imagine sitting for up to an hour, stirring, stirring, stirring...

 

[MurrayMinchin]

Well, who knew?

Pyrex encapsulated magnets exist for stirrers: https://www.belart.com/bel-art-f371...o-stirring-bar-glass-coated-25-4-x-9-5mm.html

 

[MurrayMinchin]

Canadian source, for those interested: https://www.coleparmer.ca/p/glass-encased-stir-bars/48785

 

[fgorga]

A teflon coated stir bar would work just fine for this application as well.

Stir bars coated with teflon or glass are meant for high temperature applications and applications involving strong organic solvents or high concentrations of strong mineral acids. These are, as you might expect, more expensive than stir bars coated with polypropylene.

Do be careful with glass coated bars, they crack easily if dropped. If one does not notice a hairline crack, one can get some 'interesting' results when the solution you are stirring reaches the metal bar and 'stuff' leaches into the solution you are stirring.

We used to buy only teflon coated stir bars when I was actively working/running a lab. They are good for all applications and have no worries about cracks.

 

[MurrayMinchin]

A teflon coated stir bar would work just fine for this application as well.

Stir bars coated with teflon or glass are meant for high temperature applications and applications involving strong organic solvents or high concentrations of strong mineral acids. These are, as you might expect, more expensive than stir bars coated with polypropylene.

Do be careful with glass coated bars, they crack easily if dropped. If one does not notice a hairline crack, one can get some 'interesting' results when the solution you are stirring reaches the metal bar and 'stuff' leaches into the solution you are stirring.

We used to buy only teflon coated stir bars when I was actively working/running a lab. They are good for all applications and have no worries about cracks.

Thanks...those are really good points