cyanotype failure to clear

[Shannon Stoney <shannonstoney@earthlink.net>]

 Recently the cyanotypes I've been making have not been clearing.  It used
to take five minutes of washing, with 4-5 changes of the water in that time,
to get all the yellow out, but now it takes longer, and sometimes I don't
realize it didn't clear till the print is dry and the back of the print is
blue.  What could cause this?  I wonder if it has to do with the solutions
aging.  They have been around since May.  Should I make up new solutions?  I
am using the same paper as always.

--shannon