If the Chinese can do it, so can the Thais:
"prepare a mould, then mix the right amounts of resin, starch, coagulant and pigments to make egg white. Sodium alginate, extracted from brown algae, gives the egg white the wanted viscosity. Then add the fake egg yolk, a different mix of resin and pigments. Once the proper shape is achieved, an amalgamate of paraffin wax, gypsum powder and calcium carbonate makes for a credible shell."
https://newsfeed.time.com/2012/11/06/how-to-make-a-rotten-egg/