Color Change in MSU Fertilizer

[Happypaphy7]

It was only slightly dark at the very top surface a couple of months ago while it was still sealed.
Now, more than half the bag has turned darker. I did not put water in it.
Would it be still good to use??

 

[monocotman]

I use my rainmix which is very similar all the way until it’s almost sloppy. These fertilisers are very hygroscopic and need to be kept very dry if you want them to stay in a pristine state,
David

 

[Ray]

It’s fine.

The indicator dye is pH sensitive, and the tiniest amount of absorbed humidity can shift it. No problem whatsoever.

 

[Happypaphy7]

Thank you!!

 

[Brabantia]

Take your bag in an other bag with a little silica gel.

 

[Ray]

I’m not sure that would work. The calcium- and/or magnesium nitrate might attract moisture more strongly.