The gland of the Stramonita Haemastoma snail that is the basis of the Tyrian purple color. This gland is dried for preservation of the gland and intended only for expert dyers who wish to try the process of creating Tyrian purple themselves from the beginning. For those who do not have access to Murex snails themselves, this is a great way to use it. Sold in increments of 10 grams.