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Its inner chamber’s dimensions are approximately: 4x2.5x2.8cm. (1 5/8"x1"x1 1/8"). I filled all cracks due to germination with tagua dust and a non-toxic, acrylic furniture finish, that I then ground smooth.
Tagua nuts are a renewable product of the rain forests of Central and South America. They are a viable alternative to animal ivory.
The last picture shows a raw tagua nut, so you have a better idea what I do. Each nut has its own unique pattern, similar to a fingerprint.