W/NW alternative process prints

[Freakscene]

How do yo get wine tannins? Is this some kind of extracted form or…?

You can buy them for controlled winemaking. I am not sure if that is what @mrtoml used.

 

[Freakscene]

Another cyanotype. I left the paper a couple of days and it seems to gain sensitivity but lose contrast.

This is consistent behaviour for oxalate complexed light sensitive materials. Humidity changes the contrast and tonality too.

 

[Muggins]

Disaster! Just washed the pillowcases abs c this is the result - what did I do wrong? Especially as the underside is still blue-ish where the solution came through when it was applied.

Edit - there was apparently a hydrogen peroxide based whitener in there as well as soap.
View attachment 4876715

Looks more likely to be bleach in washing powder, as peroxide speeds the oxidation.

 

[mrtoml]

How do yo get wine tannins? Is this some kind of extracted form or…?

You can buy wine tannin I think pretty easily. I got it from Amazon.

It's better to use tannic acid, but this is harder to source. I used ebay. Tannic acid doesn't stain the paper so much.

This video is very informative:

 

[titrisol]

Scottsbluff NE
Coffe toned Cyanotype

 

[titrisol]

Here is another cyanotype I did today. PiezoDN negative on Hahnemuhle Platinum Rag. Very quick bleach in sodium carbonate solution. This paper was coated 2 days ago and seems to be more sensitive now than before.

View attachment 4876117

Depending on the paper, cyano chemistry reaches maturity in 2-5 days and begins losing quality after 4-6 weeks