This coarse grain sea salt is ideal for bath salts. It averages several times the size of our fine salt. Average grain size is approximately 1/4". We suggest using a mixture of fine with the coarse salts when using this product. Normally we suggest to our customers 90% fine, and 10% coarse. If used alone this salt may be alittle to big for most people to use comfortably in the bath.We recommend using dyes to color the salt rather than pigments. Dyes will dissolve in the water rather than settling out on the bottom of your tub.