Mrs. Stewart's Bluing is the time-tested solution for keeping white fabrics brilliantly white. This concentrated liquid formula works by adding a trace of blue to white fabrics, which optically counteracts yellowing and makes whites appear whiter and brighter. HOW IT WORKS: Over time, white fabrics naturally develop a yellow tinge from washing, wear, and age. Mrs. Stewart's Bluing adds a microscopic amount of blue dye that neutralizes yellow tones, restoring the crisp white appearance. EASY TO USE: Simply add a few drops to your wash water (dilute first to avoid spotting), add your white laundry, and wash as normal. Works with any detergent in hot or cold water. TRUSTED QUALITY: Since 1883, Mrs. Stewart's Bluing has been America's favorite laundry whitening solution. Generations of families have relied on this proven formula for keeping whites looking their best. ECONOMICAL: This concentrated 8 fl oz bottle lasts for months, making it an incredibly cost-effective solution compared to repeated purchases of new white items. MULTIPLE USES: While perfect for laundry, Mrs. Stewart's Bluing is also used for craft projects, whitening pet coats, science experiments, and even tinting pool water.