Re: (Fwd) Re: Color UV?

[boblong@xxxxxxxxxxx (Robert Long)]

On Sat, 25 Jan 1997 21:42:38 GMT, Willem-Jan Markerink wrote:

|On Fri, 24 Jan 1997 21:01:21 GMT  Zoe Paddy Johnson CIRT CSOS wrote:
|>> In one of my old Biology text books there were two color pictures of =
some=20
|>> flowers.  One was regular color, the other was the same flowers with =
the=20
|
|There's an option that I didn't see in your list.  Think about "black =
lights",

Only Zoe and Geoff can give a definitive answer, of course, but my
reading of their post suggested that it was the film "seeing" UV and
"reporting" it as blue that was involved--not fluroescence, which
wouldn't necessarily produce visible blue light.

But another possibility that I don't remember from their list was that
the "plain" photograph was made through the usual UV-blocking ("haze,"
whatever) filter and the second (with the blue UV markings) with this
filter removed.

Bob Long
(boblong@xxxxxxxxxxx)

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