Hi! Hope this can help you! :)
Glycerin soaps are soaps that contain glycerin, a component of fat or oil. They are recognizably different from other soaps because they are translucent. The clarity is due to the alignment of the soap molecules, which can be induced through the addition of alcohol and sugar. This is usually done for homemade glycerin soaps that are not remeltable. 
The process for making glycerin soaps was well known as of 1857 in the Western world.  In modern industrial soap-making, the glycerin is usually separated from the soap to be resold and used in a wide variety of areas such as for personal care products, pharmaceuticals, chemical intermediates, and food processing. - Wikepedia
Hi! maybe this will help
The difference between translucent “glycerin” soaps and other more opaque soaps with glycerin in them, is that the glycerin soaps have been cooked with certain solvents like sugar, alcohol, and, well, more glycerin, to help make the soap crystals small so that light can pass through. (It's the soap crystals that reflect light back at our eyes, making soap opaque).
Michaels crafts sells it it’s clear it’s unscented and no color soap.