"Cooking", by itself will not affect acidity. However dilution and reactions between the acid and any added components will definitely affect the acidity. The only simple way to determine the final acidity is to measure it. Rich Stevens http://mysite.verizon.net/rstevens15 Photo Trend Enterprises- A Restaurant Service Company I cook with wine, sometimes I even add it to the food. -W.C. Fields -----Original Message----- From: owner-chile-heads@globalgarden.com [mailto:owner-chile-heads@globalgarden.com] On Behalf Of Mike Benson Sent: Tuesday, September 21, 2010 7:51 PM To: chile-heads@globalgarden.com Subject: Re: [CH] "Vinegar Powder" Anybody know if any of the common powdered acids (vinegar powder, citric acid, fumaric acid, ascorbic acid, etc.) hold their acidity well after cooking?