Resulting from Nurwodah's question at povray.newusers, this from their 
posted SDL:

A dark cyan line within an object (glass block) parallels the red cylinder 
light source, which can also be seen dividing a refracted portion 
horizontally at the upper left and appears to lack the cyan color.

Please be aware I'm using the updated POV-Ray 3.6 (3.6.2) Chris Cason has 
been working on, simply because I haven't gone back to Windows Vista to try 
3.6.1c yet.

Bob

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