Mustard Baths - 1kg Refill BagLess packaging, less waste. Use to refill your Cabinet of Curiosities Mustard Bath jars or fill your own decorative container. 1kg. Our Mustard Baths are enduringly popular in the apothecary in Haworth. We've been making them to the same formulation in our workshop for thirty years and they are still a best seller. Inspired by the traditional Victorian Mustard Baths which were used for colds, aches and pains ours are still made with the finest quality