IP sitting for a couple weeks in a close container sould not be a problem. I would test the ph and dilute or enhance accordingly. (I hate to waste good material). A ph kit is very cheap and you can pick one up at any wal-mart. Does your set up require heating of the IP? The coloring you described sounds good to me, but look for streaking or way off color bands on the surface. That is an indication of a ph problem. After you IP the part bake it for about 10-15 mins at around 250-300 to be sure that all the IP is dry and the surface conversion is complete. Beyond that I'd say an extra 20 mins in the oven should solve your problem. Let us know how you make out.
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