Calcium Chloride is used to make spheres out of purees.
Use Calcium Lactate to make spheres out of food without adding any flavor.
Calcium Lactate Gluconate is used for the spherification of foods that are acidic, high in alcohol or fat.
Sodium Alginate is used with Calcium Salts to create spheres.
Sodium Citrate can be used to make spheres out of acidic fruit juice.