As someone who has incorporated cremains into dice before, I would suggest adding them to blank inserts. Once in the resin, they will turn brown-ish (not a problem if you are making opaque dice).
Clacksmith
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The plan is to do it differently in each die. The 100mm has a partial blank that will act as a stand for his items. That blank will be made from his ashes. The 60mm will do something similar but instead of items it will have a lock of his hair on the partial blank. The standard sets will be a swirl of his favorite colors and his ashes.
I talked to someone else who makes resin memorial items and they warned me about ashes sinking and not being grey when encased and my plan is to put some of the ashes in an alcohol bath and stir it up, let it sit for a few minutes, and pour the ash that hasn’t settles into a drying dish so I can collect the ultra fine ash to use for the standard sets to help prevent it from sinking. That aside, the color won’t be a huge issue.
I had sifted mine, but your steps should give you a more uniform consistency.
You can increase the viscosity to help suspend the ashes by using a "pin dip" of clear school glue (Elmer's is the brand I use) often used for making slime. Add it after mixing the remains into the resin and mix again. I use this trick to suspend chunky glitter and it worked well for the cremains.
It definitely won’t be easy. He was my best friend for almost 30 years. He introduced me to tabletop games when we met and he had a huge collection of games. I think he would appreciate the resting place and being included in games. The last few years he wasn’t able to do much other than GM and he put everything he had into it.
That die master looks amazing. I can tell you're putting your all into this. No more fitting tribute.
That’s pre polish. I’m not using this one because I screwed up the measurement and the numbers font is too tight in places. Next print is much larger and has a different font for the numbers. The big one is almost 80mm face to face. The largest I can make it with the software. The others are the other sizes for the people who are not his wife. The middle one is larger than the one in the original picture but not by much.
This is an incredibly sweet memorial for your lost friend.