[Rockhounds] colour perception, organic fluorescence, etc

[Axel Emmermann]

Hi JR
 
> One eye was closer to Ektachrome and one was closer to Kodachrome - go
figure.  

[Axel] I've seen that too but it's not constant. I think it may be related
to peripheral vision and after -images (suppose you're driving a car on a
coast way while the person in the passenger seat is wearing red. Sea is on
your left. After a short time the blue of the sea may cause your left eye to
see a slightly yellow overtone while the red sweater causes you right eye to
see a litter greener. Just a theory).

> Axel, here in the North American forests we have several woods that
fluoresce under the
> right stimulation.  Locust (I think the black locust variety native to the
WV forest) glows, as
> does the shrub sumac.  This isn't the poison sumac which I think is a
western shrub, this is a
> shrub which bears bright red fruit clusters with which you can make a
pleasent non-
> intoxicating beverage.  It glows best in long-wave "black light".  I don't
remember which
> spectrum locust responds to best.

[Axel] Some trees do fluoresce! I saw a piece of wood from an acacia tree
that fluoresced like it was soaked in uranyl salts.

> 

[Axel] Merry Christmas[Axel]  to you too!
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