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The New IPA: Ch. 13

Haze has turned into a beer style at this point. Which is odd, because it doesn't indicate flavor, only a visual attribute. Haze hounds, haze heads, and haze bros are known terms that are vying for space in the Merriam-Webster. So Chapter 13 will be all things haze for you haze hounds.

Permanent haze results from the binding of oxidized polyphenols and proteins

If you dry hop during early fermentation, more haze will result. As fermentation goes on, the proteins will be depleted and will offer polyphenols less opportunity to bond. 

3.8-4.3 pH is ideal for haze formation.

Unmalted wheat, compared to barley, leads to decreased haze levels. Furthermore, the more unmalted wheat, the less polyphenols in final solution. These results are due to the absent protein modification that would typically occur during the germination stage of malting. During germination, proteins are degraded, meaning the endosperm is converted into soluble peptides and amino acids. The longer a fermentable is germinated, the more permanent haze will occur. The Kolbach Index Percentage is the measurement of such germination duration.

Irish Moss is added with 10-15 minutes left in the boil to take away beta-glucans and wort-soluble proteins. Furthermore, Irish Moss can reduce astringency that results from high-protein grist. I feel like Irish Moss is a must if you don't have access to a centrifuge or filtration system and are planning to make a lager or old school pale ale. 

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