Butter scotch taste

What went wrong? Was this supposed to happen? Should I throw it out? What do I do now?

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Butter scotch taste

Postby rathskellar » Mon Jun 07, 2010 5:37 pm

I brew all grain and extract. Why do I get butterscotch taste sometimes with all grain but never with extract? Example made a Blonde in full grain and another in extract, same recipe and fermented side by side. Again all grain butter scotch but with the extract. Confused.
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Postby jawbox » Mon Jun 07, 2010 8:32 pm

Sounds like diacetyl. It would give a pronounced butterscotch flavor in high enough concentrations.
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diacetyl

Postby slothrob » Tue Jun 08, 2010 7:28 am

One possibility I can think of is that your water is lacking some trace mineral (zinc, maybe?) and stressing the yeast. The extract contains the minerals from the mash water used by the manufacturer which may be supplying this need. You could try adding some Servomyces yeast nutrient and see if it solves the problem.

Another possibility is that you're contaminating the brewing area with grain dust and getting a diaceyl producing microbe in the beer.
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