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Examples
1. And it's that small percentage of the illuminant gases, ethene, acetylene, C2H2, or ethane, as it's known today, which give it the luminosity.
2. And not all watches are going to have lights, but a lot of them are going to have illuminant and you want to look at, okay, is it raised and, again, turn off the lights look at it in the dark after you’ve exposed it to some light and look at how it reacts.
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