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You are here: Home / Beverages / Alcohol / Finings / Isinglass

Isinglass

Adding isinglass to water to make a solution

Adding isinglass to water to make a solution. Agne27 / wikimedia / 2012 / CC BY-SA 3.0

Isinglass is a gelatin-like substance that can be purchased in dried or liquid form.

It is developed from fish, using the bladders that hold air. The bladders are shredded, freeze-dried and ground into a powder. For the liquid form, the powder is dissolved in water, and sold as such.

It’s used as a “fining” — to clarify liquids such as beer, cider, wine and juice to remove the particles that make them hazy otherwise. When added to such products, the collagen in the isinglass binds to yeast cells and other solids present in the liquid, making them bind together in heavy lumps (this is called “flocculation“) and causing them to drop to the bottom of the brewing vessels, where they can be left behind when the product is bottled.

Adding isinglass to vat of wine

Adding isinglass to vat of wine. Agne27 / wikimedia / 2012 / CC BY-SA 3.0

Isinglass is not as powerful as other finings, but it has very little impact on the taste of what you are clarifying.

When used, it means essentially that that product is not vegetarian.

It is also used in making some glues and cements, and used to be used in making gelatin.

It was also used historically in unrefrigerated egg preservation.

Fish that isinglass is typically produced from include hake, cod and sturgeon.

Isinglass sheet

Isinglass sheet. Gixie / wikimedia / 2009 / CC0 1.0

Cooking Tips

Use 1 ml of isinglass per 250 ml (8 oz) of beer or wine being clarified. Let stand for two weeks, then rack.

Storage Hints

Store in a cool place, tightly sealed.

Isinglass in liquid form

Isinglass in liquid form. Matt Brown / flickr / 2015 / CC BY 2.0

Isinglass sold for use as gelatin

Isinglass sold for use as gelatin. Swinborne’s Patent Refined Isinglass Gelatine. Francis H. Leggett & Co. Circa. 1870 – 1900. Philadelphia, PA. From collection of Boston Public Library. / Public Domain

This page first published: Apr 5, 2004 · Updated: Oct 21, 2020.

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Tagged With: Finings, Gelatin

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