Tubes on the right had been in the light for 5 days.
Tubes are numbered #A1 - A4, from left to right.

There are similar tubes under the box.

After sitting for five days.

These tubes had been in the dark for 5 days. Tube #2 is usually more yellow.
Tubes are numbered #B1 - B4, from left to right.

Last updated by Steve Muzos October 10, 2003

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