What would modern language look like if humans also communicated via bio-luminescence?

Suppose human beings have evolved markings covering the face and hairs. The cells contain a colony of bacterium capable of producing multiple arrays of visible light. Each bacteria reacts differently to a variety of chemicals secreted from our sweat glands. This complicated mixture of chemicals is controlled by our emotional states as well as the environmental factors such as humidity and temperature etc.

How can the complex brilliant display of bio luminescence be incorporated into our written language and what will it look like? Not to be confused with camouflage(chromatophores).

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What would modern language look like if humans also communicated via bio-luminescence?

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