And for further Confirmation, though I once Purposedly kept it so near the hot Iron I just now mention'd, as to make it sensibly Warm, yet it shin'd more Dimly than it had done by Affriction or the Flame of a Candle, though by both those ways it had not acquir'd any warmth that was sensible.
"Experiments and Considerations Touching Colours (1664)"
Robert Boyle