Top: shellac and baking soda.

Middle: shellac, baking soda and powdered eggshell.

Bottom: shellac, baking soda, powdered eggshell and vinegar.

3/15/18 Waiting to see how they harden.

After one day they all became very hard. Great stuff, except for the one with vinegar, it was a bit brittle. And…

After leaving the other two in water overnight they turned to goo. (Top) Shellac with baking soda. (Bottom) Shellac with baking soda and powdered eggshell.

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The shellac-only layer stood up well to the same test. It was only slightly softer, it didn’t turn to goo.

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