I bought a Wine Experts Pinot Grigio wine kit and the packet of isinglass is cloudy and has white bits floating around in it. I suspect it is bad. Has anyone seen that before?
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1 Answer
I have never used isinglass, but was sufficiently interested to read around the subject a bit.
It seems like that if you are talking about liquid isinglass, it does have a fairly limited shelf life. This website [1] suggests that isinglass has a shelf-life of 4 - 8 weeks tops if stored at below room temperatures. Above 20C / 68F the proteins in it can denature (alter the protein structure). This can lead to white lumps floating in the surface of the liquid.
Sounds a bit like what you are seeing. It is possible that the kit was stored at too high a temperature prior to purchase.
The same website suggests that it is better to use powdered isinglass or flocs (==flakes) since these have a better shelf life and are easier to store.
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Yes, it was liquid isinglass. The kit was older (8 months from manufacture date) but well with in the acceptable limits. I ended up not using the isinglass because I was unsure and it is relatively inexpensive. Thanks! Commented Jul 1, 2011 at 14:17
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