Problem with Cyanotypes

[bryan_hamill]

<p>Hello, I'm new to making cyanotypes and am having some issues. I've done about 20 or so of the same image - mixed the solution, coated the paper, and exposed for 15 minutes on a UV light box (I'm doing 4 at a time), then put in a water bath with some hydrogen peroxide. Some of the prints look great, though the colors in others aren't as rich, and some still have a yellowish/greenish tiny after washing.<br>

Any idea what variable could be causing this discrepancy? could it be the weight of the books I'm using to hold the paper down to the negative? Is the paper not dry enough? not letting the paper sit in the bath long enough?<br>

any suggestions would be extremely appreciated.</p>

<p>cheers</p>

[chris_waller]

<p>First make sure that you are coating the paper very consistently. Secondly, I recommend you wash the prints thoroughly before you put them into the hydrogen peroxide bath. Perhaps you peroxide bath is becoming exhausted as you process more prints.</p>

 

[andrew_brown7]

<p>Hi,<br>

The timings aren't as important as the tones you can see under the UV. You must be very careful of your eyes with the UV. <br>

Continue printing until the highlights begin to show. AFAIR Cyanotypes are usually just washed and then let to dry.<br>

Are you sizing the paper first?</p>

[jack_welsh]

<p>Found that using vinegar works quite well</p>