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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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up vote 1 down vote accepted

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.

[1] http://www.practicalbrewing.co.uk/fining/page5.html

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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! –  nbushnell Jul 1 '11 at 14:17
    
How is the wine looking ? –  Poshpaws Jul 4 '11 at 9:39
    
Just fine thanks, it is a Pinot Grigio. –  nbushnell Jul 5 '11 at 14:12
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