A particulate acidulant composition comprising 20-70 wt.% malic acid, 3-40 wt.% lactic acid and 0-40 wt.% of food acid selected from citric acid, fumaric acid, adipic acid, tartaric acid and acetic acid and combinations thereof, wherein the acidulant composition comprises: • 40-90 wt.% of M-particles comprising co-crystal of malic acid and partially neutralized polycarboxylic acid selected from malic acid, citric acid, fumaric acid, adipic acid, tartaric acid, and combinations thereof, said M-particles containing at least 30 wt.% malic acid and at least 30 wt.% of the partially neutralized polycarboxylic acid, wherein the M-particles are obtainable by spraying an aqueous solution of partially neutralized polycarboxylic acid onto particles of malic acid in a fluid bed dryer, and wherein the core of the M-particles contains malic acid in a concentration that is at 10 wt.% higher than the average malic acid concentration of these particles; • 5-60 wt.% of L-particles comprising co-crystal of lactic acid and at least partially neutralized carboxylic acid selected from lactic acid, malic acid, citric acid, fumaric acid, adipic acid, tartaric acid, and combinations thereof, said L-particles containing at least 30 wt.% lactic acid and at least 30 wt.% of the at least partially neutralized carboxylic acid, wherein the L-particles are obtainable by spraying an aqueous solution of lactic acid onto particles of at least partially neutralized carboxylic acid in a fluid bed dryer, and wherein the core of the L-particles contains the at least partially neutralized carboxylic acid in a concentration that is at 10 wt.% higher than the average concentration of the at least partially neutralized carboxylic acid in these particles; and wherein the combination of M-particles and L-particles constitutes at least 50 wt.% of the acidulant composition. • 40-90 wt.% of M-particles comprising co-crystal of malic acid and partially neutralized polycarboxylic acid selected from malic acid, citric acid, fumaric acid, adipic acid, tartaric acid, and combinations thereof, said M-particles containing at least 30 wt.% malic acid and at least 30 wt.% of the partially neutralized polycarboxylic acid, wherein the M-particles are obtainable by spraying an aqueous solution of partially neutralized polycarboxylic acid onto particles of malic acid in a fluid bed dryer, and wherein the core of the M-particles contains malic acid in a concentration that is at 10 wt.% higher than the average malic acid concentration of these particles; • 5-60 wt.% of L-particles comprising co-crystal of lactic acid and at least partially neutralized carboxylic acid selected from lactic acid, malic acid, citric acid, fumaric acid, adipic acid, tartaric acid, and combinations thereof, said L-particles containing at least 30 wt.% lactic acid and at least 30 wt.% of the at least partially neutralized carboxylic acid, wherein the L-particles are obtainable by spraying an aqueous solution of lactic acid onto particles of at least partially neutralized carboxylic acid in a fluid bed dryer, and wherein the core of the L-particles contains the at least partially neutralized carboxylic acid in a concentration that is at 10 wt.% higher than the average concentration of the at least partially neutralized carboxylic acid in these particles; and