P'n'P - waiting between transfer and etch?

[sfr]

I was wondering, is there anything wrong with waiting to etch your boards for a while after you've transfered the layout onto the board using the P'n'P blue stuff?  I usually do the whole process at once, but I misjudged how much ferric chloride I have, and have a couple of boards with the design transferred, but that I won't be able to etch until I can get some more.

[Coriolis]

I have had boards lying around for months with transfers on, then etching them with no problems.

C

[Paul Perry (Frostwave)]

Even if the board tarnishes, the ferric chloride etch will dissolve the tarnish straight off & go to work.