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According to the Royal Horticultural Society, it is a mixture of ammonium carbonate and copper sulphate.

I think the relative proportions are probably a trade secret, but since most fungicide control compounds include copper sulphate and one other ingredient, you can likely assume that the copper sulphate is the most important part. Thus a weak mixture of copper sulphate would likely work OK as a replacement.

Bordeaux mixture uses copper sulphate and hydrated lime. Hydrated lime (calcium carbonate) is a kinder and more easily sourced ingredient than ammonium sulphate so I would try that before Cheshunt compound.

Copper sulphate can be sourced from equestrian supply shops because it is used as a foot bath for horses (again for its antifungal properties).

Be careful using it - it is poisonous to fish so NEVER put it down the drain or on land near a river.... so only mix up what you need and keep it away from children.

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Q: How do you formulate Cheshunt compound a fungicide.?
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Cheshunt School was created in 1935.


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