How to make a copy of a right hand?
material & tool

powder for making a mold (same thing as dentists use for making a teeth
model)
(dentist's material will harden into gel in 3 minutes, but it is too
short time. in Japan we can get 15minutes harden material.)

water add

hand into the mold case

pull out the hand

water into the gypsum
powder
and stir

gypsum into the mold

vibration to the mold and finish

shopsticks in

remove and complete

Thanks to Mr.N for these pictures.