Yes, it's entirely possible to mix several Jesmonite pigments to create a customized shade. This technique is commonly used by designers to obtain customized, nuanced colors.

The dosage of pigments used to color Jesmonite depends on the desired intensity, but the standard addition rate is 2% of the total weight of the Jesmonite mixture (liquid + powder). If you add too much pigment, it may weaken the finished object, or even prevent the Jesmonite from setting.
For a light or pastel finish, a few drops or pinches will suffice. For stronger colors, gradually increase the amount of pigment, testing first.

The application of a varnish or fixative is not compulsory, but is highly recommended if you wish to protect the shiny appearance of the glitter and prolong the aesthetic durability of your Jesmonitecreation . Overall, we recommend protecting your Jesmonite creations with varnish, whether you add glitter or not.