There was a notice on the box of Coliscan that said it must be frozen for storage, but when I opened the box, the medium was thawed and liquid. Do I have a problem?
A 12. No, you do not have a problem. The medium can be thawed for 2-3 weeks at room temperature with no adverse effects. Just put the bottles of liquid Coliscan in the freezer and they will be fine. Also, if you happen to thaw too many to use, they can be re-frozen without any problem. We have kept Coliscan for a month at room temperatures without noticeable negative effects, but for long term storage life, it is best frozen as the chromogenic substrates slowly lose their brilliant color over time at high temperatures. Q 13. The pretreated plates which I received with my bottles of Easygel® look strange. Some have water droplets covering the surface of the film on the inside bottom of the plate which gives the layer a hazy appearance. Some may also have water droplets collected in the lid of the plates in some sleeves. Is this contamination or are these plates OK to use? (Conversely, you could receive plates which are so dry that the layer on the inside bottom has the appearance of fro
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