on what basis do some books say chlorine is green?

Thanks. What about for Fluorine gas?

Chlorine gas is a green colour, whereas the solid is yellow - they change colour depending on state

I asked a guy that studies chemistry, about chlorine gas and showed them that picture, he thought that was photoshopped to make a stock image, and said it should be green/yellow


Also I found this video titled "Making chlorine, bromine, and iodine" by "Tommy Technetium"
https://www.youtube.com/shorts/7v7pWGCzNS0

That shows it's yellow and not just looking yellow in the video but the guy doing the experiment, seeing it directly, describes chlorine gas as yellow. The chemist I spoke to said from what he's seen it wouldn't be quite as yellow as in that video but but that that's far more realistic to what he has seen.

Seems maybe that pic of the green chlorine gas is fake though?

from the "periodic videos" video you mention youtube(dot)com(slash)watch?v=BXCfBl4rmh0 Chlorine - Periodic Table of Videos By Periodic Videos

Is this the colour / high concentration you had in mind




It looks to me like there's a lot more chlorine in the examples in that "periodic videos" flask example(in terms of the percentage of the container that contains chlorine), than in the test tube that is in the earlier post in the thread. So it seems the concentration is higher in the "periodic videos" flask example. But the test tube example(from earlier post in thread) is greener. Why might that be?

Thanks