Here is the process of creating an acrylic pen.
I have started out with a clear polyresin based acrylic mixture. Once the pigment dyes have been mixed to create the desired colors a catalyst is added to each color.
The different colored acrylics have to cure to a point where they can be combined without mixing into each other too much, but to a point where they can still be poured.
Here is a photo of the process of creating the acrylic blank for the pen I posted yesterday.