McCormick Alum is a versatile culinary ingredient that has been a trusted staple in kitchens for generations. This convenient 4-pack provides you with 1.9 ounces per container, ensuring you have an ample supply on hand for all your culinary needs. Alum, also known as potassium aluminum sulfate, is commonly used in pickling to help maintain the crispness and firmness of pickled vegetables, particularly cucumbers. It works by helping to preserve the texture of fruits and vegetables during the canning and pickling process. Beyond pickling, this fine white powder has various applications in food preparation. McCormick, a name synonymous with quality spices and culinary ingredients, brings you this pure alum in an easy-to-use format. Each container is perfectly sized for home use while the 4-pack ensures you won't run out during your preserving projects. Whether you're an experienced home canner or just beginning your pickling adventures, this product is an essential addition to your pantry.