Light fastness and acidity of tea and coffee on paper?

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Hello, I have a question and Google has failed me, so I'm wondering if anybody here knows the answer.
I'm wondering how light fast tea and coffee are, and if it would be OK to use them as a medium in fine artworks?
For the same reason, I'm wondering about the acidity. Are there any brands that could be recommended?

Thankyou!

Not light fast.
Acidity I could not tell you precisely.

Interesting idea though, best to you.

thanks for the reply, maybe I should consider watering down liquid pigments instead

There's a woodworking technique in which used and moist tea leaves are wrapped in a cotton cloth and rubbed over a surface to color it. After drying, it should be sealed with wax, shellac, or clear coat.

Yes, diluting water based pigments is the sensible option...you know for sure it will stay.

Still, the organic, temporal nature.. and the current social importance of these herbs/beverages ..make the use of tea and coffee a great idea...
Anything one might wish to preserve could be photographed, as Andy Goldsworthy does with his temporal sculptures.