Who knows this cyanotype technique

[Helliconia]

Hello,
I'm new here, I print cyanotypes as a hobby, I've tried all techniques that I came through, like toning and two colour prints, but there are still some things that are a mystery to me. Recently I've came across a wonderful artist named Audrey Coppens, she has an Instagram account where she showcases her cyanotypes.
Some of her work have a light brown/yellow background that doesn't cover the whole page. I really like how it looks, and I wonder how that is done, is it just a paper with this colour or if it's some fancy technic, what do you think?
Here are some links for reference:

 

[koraks]

Maybe she just masks the paper when coating it with tape or some kind of overlay, so the coating remains within the confines of a neat box. Then usual exposure, toning etc.

To elaborate on the toning: you can control the degree of toning by bleaching only to the point where you want to go (e.g. just the highlights) and then tone with tea, tannic acid, coffee etc. This will leave the shadows less affected; they do shift in color from a rich blue to something less saturated and more muted.

 

[cliveh]

Why don't you contact her and ask?

 

[Helliconia]

She said that some of the papers she uses have already color, so the mystery is solved

 

[koraks]

Sometimes, the solution is even simpler than any of us could imagine!

 

[nmp]

She said that some of the papers she uses have already color, so the mystery is solved

hmmm....Then why does she have white border? Or is it mounted then on a white paper?

:Niranjan.