We talked about Glow Sticks, we talked about Fireworks. Now it feels like the right time to look at another big factor in color of compounds, the conjugated systems.

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Sources:

My publication on the synthesis of Neocryptolepine

https://pubs.rsc.org/en/content/articlelanding/2009/ob/b816608k#!divAbstract

On Colour and Coloring

https://en.wikipedia.org/wiki/Color

https://en.wikipedia.org/wiki/Additive_color

https://en.wikipedia.org/wiki/Subtractive_color

On Covalent Bonds and Conjugated Systems

https://en.wikipedia.org/wiki/Covalent_bond

https://en.wikipedia.org/wiki/Conjugated_system

https://en.wikipedia.org/wiki/Delocalized_electron

Dyes and Pigments

https://en.wikipedia.org/wiki/Dye

https://en.wikipedia.org/wiki/Pigment

https://en.wikipedia.org/wiki/Azo_dye

Magic Ink

https://en.wikipedia.org/wiki/Color_Wonder

https://en.wikipedia.org/wiki/Leuco_dye

https://patents.google.com/patent/US9573403B1/en