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Probably because I don't know what an MSDS is lol
How was my statemen misleading when I clearly said that the two MSDS differ is beyond me.
But we are only at four pages.
Probably because I don't know what an MSDS is lol
An MSDS can give lots of information. For commercial products it will list most of the ingredients and their approximate concentrations. There are a few exceptions; non-dangerous chemicals present in small amounts may not be listed and chemicals that are trade secrets are usually marked as such. You could use the MSDS's to compare the various Rordinal incarnations.
Something like the attached, producing hydroquinone and methylamine?The reason I asked is that I was unaware of any literature on the subject. I could not see any plausible hydrolysis other than the formation of p-aminophenol.......
An MSDS can give lots of information. For commercial products it will list most of the ingredients and their approximate concentrations. There are a few exceptions; non-dangerous chemicals present in small amounts may not be listed and chemicals that are trade secrets are usually marked as such. You could use the MSDS's to compare the various Rordinal incarnations.
Something like the attached, producing hydroquinone and methylamine?
If that is unlikely it is even more unlikely with p-aminophenol which has an equation producing gaseous ammonia.
The metol based developers where the manufacturer claims a shelf life of 6 months in a full sealed bottle may (my theory) decompose by hydrolysis , unlike Rodinal.Both ammonia and methylamine have very distinctive odors that I have never detected in aged bottles of Rodinal and Kalogen.
The metol based developers where the manufacturer claims a shelf life of 6 months in a full sealed bottle may (my theory) decompose by hydrolysis , unlike Rodinal.
In the attachment I posted above for simplicity I left out 1/2 H2SO4 from the metol side.
Why so? If you add ammonium chloride to Kalogen developer there is no evolution of ammonia?In a highly alkaline developer like Kalogen the sulfuric acid portion of the metol has already been neutralized. Any ammonia or amine would be released unchanged.
Why so? If you add ammonium chloride to Kalogen developer there is no evolution of ammonia?
How is methylamine sulfate different?
This probably does happen in the B bath of Thornton's 2 bath developer which has an amine-like smell after some use . It contains carried-over metol but notably no sulfite.In a highly alkaline developer any ammonia and amine will be released as it forms.
Staying perhaps usable but certainly not the same as fresh. The useful life can be extended by transferring the concentrate to small glass bottles.
This is the key. I just completed 12 year experiment with a bottle used only for the experiment. Crystals formed and I quit. The film development was fine for 12 years.
Crystals in Rodinal is normal, did you actually develop anything? Just shake up the crystals and they re-dissolve, if you don't want it send me the bottle! Seriously.
Well there's two different things were talking about, I don't know if Roberts measured actual Adox Adonal (original Rodinal formula) or if he measured one of the other variants because the other ones for example R09 are not the same, they contain slightly different chemical mixtures, and do not last as long. They still process relatively the same as long as their new, but if left on the shelf for 10 years the R09 will not last as long...
If you can make predictions like that you should be betting on horsies.
(there was a url link here which no longer exists)
If you decant or filter it won't last as long.
Zorkicats painkiller trial samples were still ok last time I looked...
Both ammonia and methylamine have very distinctive odors that I have never detected in aged bottles of Rodinal and Kalogen.
Am I to understand that you actually own a bottle of Kalogen from 1924, the last time it was ever made.
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