the present invention is directed to a liquid coffee in which the development of acidity has been inhibited and which results in a longer shelf - stable product . the method used in making the liquid coffee product of the present invention includes treating the coffee extract with an alkali , the alkali being present in an amount effective to convert acid precursors present in the coffee extract to their respective acid salts , and thereafter neutralizing the treated coffee extract with an acid , the acid being present in an amount effective to neutralize any excess alkali from the first step and to adjust the final ph of the liquid coffee product to the desired value .