Template:POTD/2012-01-31
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2012 January
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Picture of the day
A
light microscope
image of
tissue paper
. The tissue was illuminated with
ultraviolet
light making it glow blue due to natural
autofluorescence
, the same effect which makes paper glow with a
black light
. The tangled network of fibres are
cellulose
fibres which are derived from
wood
and make up all types of
paper
and
cardboard
. It is a combination of the properties of cellulose and additional
optical brightening
agents which makes the tissue glow.
Photo:
Richard Wheeler
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