Could I use a foam cup for the rock candy instead of glass?
Md Ariful Islam
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Dr. Md Rushad Rahman
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No, you don't want to use a foam cup, a plastic cup, or any other kind of cup except glass. Glass jars or cups have very few porous spots. Generally speaking, glass is completely smooth, therefore it gives no opportunity for crystals to accidentally grow on it instead of your string. Foam cups are extremely porous. Using a foam cup would result in chaos, with crystals forming all around your cup or you will just get an ugly dried-out lump of sugar that doesn't crystallize.
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