1. Interpretation of the recipe 87v from 640

Ingredients

Sand

Apple cider vinegar with mother

Pestle
Mortar
Sieve

bake the sand enough to dry it（baked for ten minutes. The dried sand felt much drier than the original sand, which is sticky and wet）
pulverize on porphyry: grind with the rolling pin. At first there are big bumps and lumps, numerous holes appear on the surface of the sand. While grinding, the holes gradually became smaller. The rolling pin could not go smoothly back and forth on the sand since there were a lot of bumps and lumps; it also made sounds when the rolling pin encountered the sand. There were bumps left on the rolling pin.

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Sieve: According to visual observation, the sieve worked better than the rolling pin. The particles are finer, some bigger particles were blocked at the first level sieve, and some smaller particles were blocked at the second level. Still, there were some big particles escaped the sieve successfully, which we think might have negative effect on the texture of the sand.

First level sieve

Second level sieve

Big particles blocked by the sieve

The filtered sand

Mold A: grind bigger
Mold B: sieved smaller
A: 400ccm 400g by measure cup+100ml vinegar
B: 270ccm 270g by measure cup+80ml vinegar

Mold A: We first laid a thin layer of sand at the bottom of the wooden frame, then we pressed the plaster model into the sand. And we poured the rest of the sand and pressed the sand with a stone pestle. At first the model moved slightly and there were cracks on the surface of the sand around the model, after ten minutes the model got fixed and no longer moved when touched. Then we filled the mold with rest of the sand.

Question: moisten the powder with strong vinegar (how much should we add the vinegar? In what way? Pour? Or other ways? The recipe does not talk about that clearly. )