Recent content by J 3

Does anyone know if Luis, the author and photo process specialist, is still with us? I ran across an obituary for a Luis Nadeau born 1947 who passed away Oct 10th, 2022 in a Quebec hospital. Luis' biography lists him as having been born in '51 but this seems rather close.

P.S. In addition to solar enlargers, and high powered single die LEDs I've also heard of people back in the day using high powered arc lamps of the kind used for search lights for carbon processes with large negatives. It's possible, but not very practical.

Glass does let much of the UV used in alt process to go through but blocks the UV C that isn't generally used anyway. Fused quartz is used for UV C applications I think. What blocks ultraviolet are the coatings on lenses. Thankfully many enlarger lenses are simple and uncoated. This idea was...

I was looking into the old version of this lens (lettering on front rather than side of the front element) when I noticed something. The rear elements on these lenses are not all the same in the various listings (only looking at the old version). Some of them are rather short narrow tubes kind...

That is a huge advantage. Having to deal with registration on paper that's been processed is something I'd prefer to avoid without clear reason to need to. The image with palladium is a little warmer than platinum. The effect by my eye the effect is exaggerated by photography. Pure palladium...

I really like the green look of these. I just wish there way to achieve the look with something a little more stable than a salt print. Looking at cyan over Pt/Pd, those seem to very between cyanotype with deeper darks to a platinum print with a split tone effect depending on how far the cyan...

I always wanted to try that formula. Seem to recall I heard it first on a Joe Van Cleave video but I might have that wrong.

That's what I was thinking when you wrote "Most conventional develpers are alkaline which means now the Prussian blue is bleached.". Amadol will develop in an acidic solution and has no secondary stain (does have tons of other problems though). The other option would be just put the image in...

I certainly will do so if I stumble across anything. The easiest way I can see to make it less finicky has consequences. Changing it from a solvent-physical developer to a standard physical developer would make things more predictable and less reliant on things like agitation. The idea would be...

A lot of film stock is coated with multiple layers of different speeds (grain size). With color you'll have multiple cyans, magenta and yellows (e.g. 2 of each). With b&w you'll have multiple layers with different grain sizes. This gives greater tonal range I've heard. Does anyone know why they...

After seeing the RD Specialties offering It have to say Ilford's offering is pointlessly overpriced. I was just trying to reconcile why they would sell such an expensive setup solely for the purpose of creating inkjet paper (not my thing but what do I know - Inkjet prints line the walls of...

Thanks so much. The pre-fab RD Specialties rods are much more reasonably priced (quarter of the price Of Ilford's) and come in any thickness you could want. They Will also make larger coating roads but you have to request a quote on those.

Thanks. That was my mistake. I thought barium sulphate was one of the natural clays (though it need to be synthesized to be bright enough) but it's not. It's a good visual metaphors regardless for what dragging baryta might be like though. Article I saw doing it used a glass tube with some...

I don't think anyone is implying otherwise (quite the contrary) but of note is that many of the experimenters and entrepreneurs of old often saw things differently than we do. Sometimes very differently. It was known quite early that you could use hypo or later rapid fix on wetplate. Cyanide...

I have a copy of that book (I've got an interest in both Lippmann and Holography but don't see being able to scratch that itch til I don't live in an apartment) and will look it up. Your description is quite good though. I hadn't really known about solution-physical developers til this thread...