<Tr> <Td_colspan="2"> Infobox references </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> </Tr> <P> Potassium bitartrate, also known as potassium hydrogen tartrate, with formula K C H O, is a byproduct of winemaking . In cooking it is known as cream of tartar . It is the potassium acid salt of tartaric acid (a carboxylic acid). It can be used in baking or as a cleaning solution (when mixed with an acidic solution such as lemon juice or white vinegar). </P> <P> Potassium bitartrate crystallizes in wine casks during the fermentation of grape juice, and can precipitate out of wine in bottles . The crystals (wine diamonds) will often form on the underside of a cork in wine - filled bottles that have been stored at temperatures below 10 ° C (50 ° F), and will seldom, if ever, dissolve naturally into the wine . </P>

Is cream of tartar an acid or base