1, oil walnuts, but to grasp the amount and frequency of oil, just twice a month. Oil walnut can promote discoloration and avoid cracking caused by large temperature difference.

2. Walnut bagging means putting walnuts in a plastic bag, filling it with air, tying it up, and then playing on a plate for half an hour, so there will be water drops inside. Take out the walnuts, coat them with oil before drying, put them in the plate again, and repeat the cycle.

3. Using the machine tray can not only free hands, but also achieve the effect of color change faster. If you use the machine disk, you can play with different brushes and consumables to achieve the desired effect.