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CELESTEEL [Production]

Celesteel expands visibly when exposed to sunlight or moonlight. The name is a misnomer however, as it really has a large thermal expansion coefficient, which makes it great for thermometers, don't confuse it with solar steel, as it is rather brittle under impacts.
-Alchemist H. Green

Note from the editor: As an extra challenge, we suggest you try this puzzle with both inputs in the small chamber.