What is the method of making leather eggs and the proportion of the recipe?

How to make homemade leather eggs:

Main ingredient: 10 duck eggs, 35g of food-grade sodium hydroxide, 20g of ground black tea, 40g of salt.

Supplementary ingredients: 1,000g of water.

1, prepare the materials.

2, clean the duck eggs, and then rinse again with clean and cooled boiled water.

3. Take out a container and pour salt and black tea foam into it.

4. Stir the ingredients well.

5. Take out another container and put sodium hydroxide into it.

6: Slowly pour in the salt and black tea froth that you stirred well before.

7. Stir well until the sodium hydroxide is completely dissolved.

8, then put the duck eggs into a container.

9: Slowly pour the stirred sodium hydroxide into the container of duck eggs.

10: Put the lid on and seal it.

11, label with the date of making.

12, marinate for 55 days and then you can open the lid.

13, take out a duck egg.

14、Wash the surface.

15, peel the shell.

16, after peeling the shell you can eat.