As the green chlorophyll drains away from each leaf, its underlying colors can be seen — in most species, yellow or brown.

Source: https://www.chicagotribune.com/lifestyles/home-and-garden/ct-home-garden-morton-0928-20231001-lnznz7caujaz3iw2xgbwkul6a4-story.html

I gave her some recipes for blood and tissue cleansing and said I could have added liquid chlorophyll but that it was not available in Nigeria.

Source: https://thenationonlineng.net/edmark-nigeria2023-closing-as-zero-business-year-5-shareholder-lock-down-majority-shareholders/

Not only does fake grass smell bad in the the summer, but when the Sun is burning it can melt and get permanently damaged - whereas a bit of sunlight on your real grass will give it a nice boost of chlorophyll.

Source: https://www.dailymail.co.uk/property/article-11886147/Im-professional-garden-designer-18-reasons-NEVER-install-fake-grass.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

“One of the first things that happens when a tree stops investing or maintaining that leaf is the chlorophyll degrades,” Hagan said.

Source: https://www.postandcourier.com/greenville/clemson-news/patience-pays-off-for-upstate-fall-foliage-report/article_1e750eb6-5c8d-11ee-aff1-3fa16ce2bc95.html

That causes the chlorophyll in the leaves to break down.

Source: https://k2radio.com/ixp/961/p/hint-of-wyoming-fall-colors-appering-already/