Methods
3.3.1 Preparation eggshell
3.3.1.1 The egg, the restaurant is not used. Clean
3.3.1.2 Pull tissue adjacent shell out as
3.3.1.3. Rinse with clean water again
3.3.1.4. Sun to dry
3.3.1.5 The crushed egg shells, and more. Prepare to be processed into chalk.
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