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Asked by roryandamy ·June 16, 2019 ·15.4k readers

WCA ratios

How much egg shells by weight to how much liquid of brv please? Thanks

Top answer

leo · Jul 27, 2019

You can't go by weight, crunch up your eggshells and char email up. Whatever volume of eggshells you have after that, put it in a container at least w0 times that volume. Then add 9 times the volume of eggshells as vinegar.

From the KNF library

From the KNF library Drafted by Claude from Office Hours and the books · Sep 2026 · 6 sources

Drake gives the ratio by weight: one part toasted eggshell to ten parts brown rice vinegar. (Office Hours Feb 2023, 48:51) The Cho's Solutions sheet says the same for WCA. (Cho's Solutions, p. 13) KNF Demystified says ten times the vinegar, by weight and volume. (KNF Demystified, p. 40)

Steps from the library:

Toast crushed shells, winnow off the membranes. (Office Hours Feb 2023, 49:33)
Put the vinegar in the container first. (Cho, Recipe, p. 60)
Add the shells slowly, a little at a time, so the bubbles don't overflow. (Cho, Recipe, p. 62)
Dissolve for 7 days with a breathable lid, and stir daily. (Cho's Solutions, p. 13)

The library does not say how to turn the weight ratio into a volume for a given pile of shells.

Sources

49:33 Office Hours (Feb 2023) — Eggshell Water-Soluble Calcium, Bone Char Calcium Phosphate · “Toast crushed eggshells until marshmallow-brown, winnow off the membranes”
48:51 Office Hours (Feb 2023) — Eggshell Water-Soluble Calcium, Bone Char Calcium Phosphate · “Yes, one part toasted eggshell to ten parts brown rice vinegar by weight.”
p. 40 KNF Demystified · “Add cooked shells to 10x of vinegar by weight and volume”
p. 60 Cho, Recipe · “Fill the brown rice vinegar (BRV) into the container first and then put the roasted eggshells”
p. 13 Cho's Solutions · “Mix 1 part eggshells with 10 parts brown rice vinegar by weight • Dissolve for 7 days with breathable lid • Stir & agitate daily”
p. 62 Cho, Recipe · “Put the roasted eggshells or oyster shells little by little and slowly into the container with BRV.”

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