Washing an exposed cyanotype - how long can I wait?

When making cyanotypes, I sometimes haven't had the time to develop/wash my prints immediately after exposure.

I then of course keep the exposed print in darkness until I can wash it - so far I've tried waiting a day or two between exposure and washing.

But I wonder, is this a problem? Should I just wash the print right away?

And if it's not a problem, does anybody have a guess as to how long an exposed print can wait before washing?

I haven't experienced any problems so far, however I have noticed that the exposed areas of my unwashed prints turn darker and more blue the longer I wait to develop them, which worries me a bit. After washing though, I don't seem to see any difference when comparing to prints I've washed immediately...

Thanks,

/Ane

From many moons past, here are the instructions from a packet I bought at some science museum:

No mention of delay for processing. I wouldn't expect that a day or so would make much difference.

From many moons past, here are the instructions from a packet I bought at some science museum:

[ATTACH=full]1313428[/ATTACH]

 

No mention of delay for processing. I wouldn't expect that a day or so would make much difference.

Thanks. That's what I was hoping.