Recent content by bnxvs

Marketers' tricks 🤷‍♂️

https://www.photrio.com/forum/threads/c-42-is-kodaks-home-version-of-c-41.89135/post-2203116

I apologize for not being able to answer right away - a little life troubles. Actually, my assumption about why the patent composition of HC-110 contained catechol is based on a once read somewhere (of cource, I don't remember where) material about the comparison of the oxidation rate of...

I think you did absolutely the right thing by adding catechol. I have some guesses as to why it's needed (it's just a hydroquinone isomer), but I'll keep them to myself for now, as I'm not sure of my conclusions. I also add it to my "simplified" water-based concentrate. So does PVP.

Thank you!

And a little humor: Scientists have found that very good absorption characteristics with respect to SO2 have chicken manure, purified by water washing. Almost 5 g SO2 per 1 kg of manure. p.s. Just don't report it to Kodak, otherwise I'm afraid to even imagine what the next modification of the...

@ doctorpepe: Actually, it would be very nice if you could weigh your product before and after saturating it with SO2, as well as measure the pH of the aqueous solution of your adduct. For example, 10 g per 100 ml of water. This would be very helpful to understand the subtleties of the process...

I think the hydration factor of the DEA adduct can in principle be neglected. Firstly, little water is released to significantly affect the properties of the adduct obtained, and secondly, the final composition of HC-110 contains ethylene glycol and diethylene glycol, which themselves are very...

In this matter in general, everything is complicated. Many sources contradict each other, strange as it may seem. Here is my data, which I usually use (in pKb) : TEA (triethanolamine) -- pKb=6.24 DEA (diethanolamine) -- pKb=5.04 So a 0.1M TEA solution should give these pH results: pH 10.3 pOH...

If I may, I would correct your arguments a little bit. Triethanolamine has less basicity than diethanolamine. And the greater basicity of its adduct in solution is due to the fact that its adduct is more susceptible to hydrolysis than the adduct of diethanolamine. Experimentally established the...

Yep! That's what the title of the post says - the 2019 version )) p.s. By the way, the recipe itself was created in 2020. And the concentrate survived storage well for a year or more with the people who tested it.

https://telegra.ph/Trying-to-preparation-of-a-concentrate-similar-to-HC-110-new-2019-version-08-21 It's also known as "KGB-20" in runet )))

Hello! First of all, glycine-photo does not lose its activity much longer than 6 months. Some batches of glycine I have stored for more than 3 years. Unless, of course, the glycine was originally pure enough. In this case, the color can be up to a rich coffee color. Secondly, there is a method...

Perhaps it makes sense to make a positive out of the "red" negative. And apply the holotyping technique to it in order to reduce the density. Mixing the original negative and the resulting positive may provide additional information. Perhaps... !!!

Unfortunately, the Life again made its own adjustments to my plans. I was forced to stop my experiments due to moving to another country... Perhaps in the spring I will be able to restore my laboratory and bring this matter to an end.