I have a Canson XL pad. I will make a few prints on that, so there is a more direct comparison. Peter

I operate in a bare-bones environment, I'm afraid Nothing sophisticated like light meters. Also my current paper of choice is the cheap Canson XL (which I have studied to death) or slightly more

Niranjan, Likely to be some difference beyond two different people doing it. There will be more to learn though if you go this route. If you keep things recorded: concentrations, drying time, method

Thanks Peter, I will order the 88% one then. I have never done this ferric hydroxide route. On the other hand, I am thinking doing the Simple process first - I already have ferric nitrate and

88% is what I purchased. It was food grade of course and no additives were listed. I don’t think brewers would appreciate any other additives. Niranjan, I would be interested to see what

Thanks Peter....I think I am sold on this FAL sensitizer. I was looking for lactic acid on line. Looks like they use it in beer making and sell 88% solution. Wonder if that is OK to use (depends on

Hi Niranjan, I don’t have the print that I sun bleached, or maybe I misplaced it but I recall there was a density loss (by eye): maybe the different forms absorb different amounts of light. I

It's not the hue of the print per se but the maximum density that impressed me - that and the fact that the step 0 is nearly white. Peter - if you leave the FAL print in the sun, there is both

This is a good solution, Peter, to let the two threads run without crossing our wires. It should be possible, Niranjan, to use lactic acid in a Simple Cy formulation - with some change in the

Hi Niranjan, I don’t see why the simple cyanotype process could not be adapted for lactic acid, hard to say though for sure..something more to try. The achilles heal with the nice depth and shade

Wow, Peter - that is some dark blue. I have been going in circles trying make a classic cyanotype having both high Dmax and clean whites. May be this has inherently those qualities. I wonder if FAL

As list owner I can change the subject. Just ask. For now let’s continue with the new thread. best, Kees

I looked to see if the title can be edited by me - it can't. Perhaps the administrator can do it. The other problem is when you make an edit, a new email goes to everyone - learned that yesterday (I

(I copied over the last few messages from the ferric oxalate thread.) Hi Mike, I didn’t attempt to calculate the stoichiometry on my FAL solution. It might be suspect starting from a ferric

Hi Mike, I will reply under a new topic “ ferric lactate sensitizer” Peter Friedrichsen

That's very interesting, Peter. I'm wondering if there is a way to change the title of a thread on this new server - say, to "Ferric lactate sensitizers" Advice anyone? I seem to have led us away

Hi Mike, Niranjan, In regards to lactate, some time ago I made some ferric ammonium lactate (FAL)using precipitated ferric hydrate. I first added ammonium carbonate to the lactic acid in the amount

OK, Niranjan. Lactotype it is, if you prefer the Latin root, or more correctly Galatype, if the Greek ( Γαλα = 'milk'). I like the hybrid Galactotype because it has a cosmic ring to it! Why start

Gracias Mike (Dr. Ware, I am assuming) for the response. I figured it was something like that. It make sense, particularly in a college lab situation. You don't want to be buying fresh chemical for

Buenas Dias, Niranjan Crystalline ferrous ammonium sulphate hexahydrate is fairly stable towards air-oxidation and loss of water. It stores much better than ferrous sulphate heptahydrate, which slowly