Recent content by Pentacon_777

Shanghai Leici 217-01 double bridge calomel reference electrode and Rex 231-01 glass electrode both from AliExpress

I managed to find industrial pH meter. It is Great Lakes Instruments model 570P. pH Meter is dismantled from old control panel and was going to recycling. This one probably works it was on the self about only three years. I can have two more meters of same model but working is maybe more so so...

Dividing into two parts gains probably really nothing but mannitol does if you read the patent that this topic originally based on. Mannitol forms Borax complex buffer as does Glycerol too and that buffer complex seems to be very stable. Magnesium sulfate is my own addition based on my reading...

"New Insights of the Fenton Reaction Using Glycerol as the Experimental Model. Effect of O2, Inhibition by Mg2+, and Oxidation State of Fe" ...pdf can be found on Google Mg+2 is mentioned there and another interesting thing is Global Sustainability in Energy, Building, Infrastructure...

I am new here and with film developers but I have some experience of process chemistry and and education too. I did read that patent and also more articles so I composed next formula (untested but I will test it) Special 7-DSApLL 1+6 concentrate Part A 680ml DI water 20g Borax 68g sodium sulfite...

Thanks for the link. Picture looks surprisingly good as reading your specs of that particular test frame

I doubt quercetin solubility too with minimum of 100ml ethanol should be possible but then mixed with water it will probably precipitate. Unless we find some common type emulsifier agent that disperses it into micro emulsion not to make dotted negatives. I became thinking maybe lecithin can work.

This should contain about these amounts of possible developing agents and antioxidants 12g cloves 1-1.6g eugenol 0.09g Gallic acid 0.2-0.3g hidrolizable tannins 0.2g quercetin 0.08g catechol 0.06g protocatechuic acid 10g roobois tea 0.01g Orientin 0.008g Isoorientin 0.012g Aspalathin 0.012g...

I wonder if next formula would be working developer Roseglow 7 12g Cloves (ground and then mixed with low polaric index solvent, example 120ml everclear and steeping mixture about 4h in 40 degree Celsius water bath. Maybe ad 1g sodium sulfite) 40g rosehip powder (steeped in 40 degree water 4h...

This research is also interesting outside of patent US3022168A https://www.sciencedirect.com/science/article/pii/S0021925817416103?ref=cra_js_challenge&fr=RR-1 But enough offtopic😅 I may post someday on more suitable topic. I did find suitable thread...

According to old swedish patent it forms buffer with borax and if I did understand correctly it can also protect ascorbic acid/ascorbates from oxidation but that may be from somewhere else than in the patent

This is my first post on forum and my latest purchase was some raw chemicals. I m planning to make developer by myself 500g D-mannitol 500g Salicylic acid 500g Ascorbic acid 1kg Borax 1kg Sodium sulfite 1kg Magnesium sulfate 1kg Trisodium phosphate Before that I ordered 10g Dimezone-S and...