>Since beer appears yellow or brownish, it must absorb more blue than red
>light.  The light detection scheme would probably work better with a
>shorter wavelength than what a red LED provides.  Try a green LED, or
>maybe even a blue LED if you can get hold of one.  However, I sortof

Not only that but since this sounds like a "change the keg when its empty at
the party" project having ablue light shining down the plastic tube of beer
may be regarded as cool :))))

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