Here are the end pieces from my brain mold. The first is cast with Smooth Cast 326. This product is another two part mixture with a color additive; in this case blue.
The discoloration in the front part of the brain happened because there was water left over in the mold when the Smooth Cast was added. The light blue discoloration is also slightly pliable. This was the first cast with the mold, so errors were expected. Still, with the discoloration, I am pleased with the cast and how the mold captured every crease.
Here are the three casts that I created during the same week. The two on the right include another plastic cast; this time in green, and a foam cast that is a result of an error in judgement in the amount of material I needed. The foam increases 6 times the size of the material you place in your mold. I underestimated and came up with half a brain. The green plastic cast and foam also demonstrate how the different mediums take the color. Both were cast with the same green dye, but the foam takes the color differently creating a lighter tone. One of the most interesting views of the plastic pieces are from the bottom with the light shining through. You can really see all of the creases and it creates an interesting pattern. I'll add a photo later if they come out well.
This cast is in foam with red dye. This time I did not underestimate the amount of material needed. Actually, there was foam pouring out of the top of the mold. The foam is much like that found in a stress ball, but a bit more tacky.