Does Dingotone have a Use By Date?

I have a bag full of different color Dingotone bottles that I bought 18 months to 2 years ago which I have never opened.
[No reflection on Dingotone as a product, it's just that I lost my work space to build the kit's, so I never got to use them]

When I opened the bag they were in last week, I noticed that with some of the bottles, the colorant had separated from the media, and appeared as a small mass of color within the media.

I'm just wondering, since these bottles were never opened, are they still viable if I shake the formula for enough of a time?
These would have been the MKI version of Dingtone.

Hi Tweaky. I think your assumptions should be correct. If they were un opened just shake the hell out of them and the solids should dissolve - give it a test run to see if it does

I would too