The polyester resin for inclusion exists since about fifty years. It was used a lot for the inclusion of compositions of flowers dried during the 60's.
This resin appears under liquid shape. After addition of a certain dose of catalyst, it fill a mould and becomes solid at the end of some hours.
The retreat caused by this hardening obliges to raise plane surfaces by sanding
The stages of manufacturing:
varnishing (for jewels)
All the materials can be included,
with the exception of certain plastics and of any fat or wet object.