philsweeney said:For most of my kallitype printing I have tailored the negative so I can use 4ml pot dichromate in the sodium citrate. So the negative needs to be about 1.5 log. Is there any good reason to consider tailoring my negatives for using 1ml dichromate, which will require a negative log of 1.75 - 1.8?
Stan. L-B said:Phil.
Have you tried Fabrino 140lb water colour paper?
And, I note you are using dichromate and sodium citrate for your Ks. where the normal chemistry for Ks here is, ferric oxalate with silver nitrate. I have no experience of your formula. As with all these processes, a slight change of the formula used, gives different tone.
donbga said:Why use potassium dichromate at all if you are attempting to build a negative with a DR to match the process?
Don Bryant
philsweeney said:I replenish per sandy king's article on kallitypes. I keep a second bottle with the appropriate amount of dichromate in it for topping off.
I want to try the cot-320. Does it need an oxalic acid bath for kallitype? Unfortunately I had no luck with the stonehenge rising, maybe I got a funky batch? I also had no luck with the artistico. Crane's platinotype is OK with no oxalic acid but I find the paper too delicate and I have to handle it very gently.
mikepry said:I too, have just tried the Cott 320 and it is magnificent. It is the nicest paper I have worked with. Luxuriant comes to mind. I don't use oxalic acid with it. I balked at the price at first but then when it comes right down to it when you think of all the work one goes through to get to the point when you actually make a print.....it really isn't that much more. The results negated any qualms I had about price.
The stonehenge I received sucked up the coating too much and image density was poor.donbga said:What kind of problem did you have with Stonehenge? I've also got some Lenox ordered, it would be nice to have a good inexpensive paper.
Don
donbga said:So if you wanted to print negatives with different DR you would have to maintain 2 bottles for each dilution, which seems very tedious.
Don
philsweeney said:As best as I can recall I tried an oxalic acid bath on stonehenge also. For Kallitype I have found if the paper is bibulous the oxalic acid does not change that. I do have humidity problems in the winter but I started to humidify the room when the humidity gets low.
sanking said:Well, the fact is I maintain about 5-7 bottles for contrast control, ranging from as little as no potassium dichromate added to the developer to as much as 16-24 ml of a 4% potassium dichromate per liter of developer. It is really not so tedious as all, you just need to have space for the bottles, and the developer lasts indefinitely.
Sandy
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