The last time I made these I tried a black swirl in the middle and used gold and black foil in the resin. This time I did it a little different and they came out better. I put a bit of black in the bottom of the mold, added cellophane, the poured in the resin with just gold flakes. The picture doesn’t do them justice, they came out way better than before and this time I’m happy with them. They are in the pile to get resin inking and full polish.
It’s a bit of a crapshoot. The weight of the black vs the colored with additives is very minuscule. It might show in a float test but in normal use not so much. If I used something like mica powder for a portion of the die that might add more weight to a side. White pigments tend to be a bit heavy so I use them sparingly and make sure they are well mixed. I do try to avoid additives that sink. I have a box of shame for glitters and flakes that sink because they would throw off the balance slightly.
The biggest factor that would throw off weight is bubbles and I do a lot to prevent those. The resin goes through a vacuum chamber with vibration after mixing and the dice cure in a pressure pot to eliminate bubbles completely.
These look amazing!