To help with the discussion I looked at the MSDS
http://www.seachem.com/support/MSDS/Equilibrium.doc.pdfProprietary blend of
magnesium sulfate,
calcium sulfate, potassium
sulfate, iron sulfate, and
manganese sulfate.
@Pamelafep
In the Chemical Forums as per forum rules we tend to answer using question to assist in learning.
Of the above compounds can you guess if any of them would turn brown due to exposure to air and/or water.
Click on the link near the top center of the forum page.
Forum Rules: Read This Before Posting.
http://www.chemicalforums.com/index.php?topic=65859.0As an aside, I split, titled and moved your post due to it not having anything to do with where you originally posted.
The moderators do this as a service to members.