printed paper as a negative

Ślepy Fotografer

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Negatives not only on Pictorico foil. A paper negative has been known for a long time - one of the first - waxed paper for contact prints, made by William Henry Fox Talbot. Plus, my video doesn't reveal anything revealing, but there's something that Mr. Talbot didn't have - he didn't have a printer.



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koraks

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I do this all the time for printed circuit boards (PCB's). I've used plain copier paper which I rubbed with vegetable oil after printing, but I found it too messy. Now I just use tracing paper.

Of course for photography I just use a camera...that's what it's for.

Btw, nice to see it works, but I have to be honest in saying that the result looks mediocre at best. Sorry.
 

Donald Qualls

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Ślepy Fotografer said:
two-color cyanotype
Click to expand...

Pretty sure the linked print image is cyanotype over gum (gum bichromate). This is a pretty well known process, and with separation negatives can be used to make "full color" images, with magenta and yellow gum layers and cyanotype for the third layer. I don't know of a cyanotype-like process that produces yellow pigment, while gum can be colored with any pigment available in water-suspended form (commonly artists' water colors).
 
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Ślepy Fotografer

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no, it's not gum bichromate, I know the process too, it's just a cyanotype, there are ways to get a color other than blue, toning, whitening, staining. There are many tutorials on this topic
 

Dany Kan

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I search for an old alternative method for etching PCB, So Do you realy use cyanotype for PCB ?I s it comparative to Dry Film method ?
Thanks
 

koraks

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Dany Kan said:
Do you realy use cyanotype for PCB
Click to expand...

No.
In the post you quoted I described using plain white paper on which I print (with an inkjet or laser printer) the artwork, and then impregnate the paper with vegetable oil to make it transparent. No cyanotype involved. You COULD make cyanotype artwork for PCB printing I think. I don't see how it would serve ANY purpose whatsoever, though.
 
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