Selected chicken claws can not be boiled, but to be dried, and then carefully remove the chicken skin with a knife, remove the bone and bone can not be connected to the place of picking off, at the same time the chicken claws in the gelatinous proteins must be retained, otherwise it may be off later, after removing continue to be dried, if necessary, can be sandpapered.

After handling the chicken claws can be played on the plate, the beginning of the plate can be played with a glove to prevent scratches, and then when the chicken claws on the edge of the grinding almost can start to play with the hand, the longer the plate to play, the chicken bone will be more permeable, the higher the degree of nephrite.