This liquid is non-toxic liquid paraffin containing
a UV sensitive photochromic dye. Indoors it appears as a clear liquid but when
exposed to natural light it immediately becomes coloured. This colour increases
in intensity when exposed to direct sunlight. The colour change is reversible,
although it takes about 60 seconds for the liquid to become clear again.
Makes a fantastic demonstration of photochromic
phenomena. The same dye chemistry is used in photochromic lenses, special
window glass etc. Photochromic cells, for quantitative measurements, can be
made, by trapping a drop of the fluid between microscope slides or petri
dishes.
Supplied as a 50ml jar
Reasons to Love
Cross applications in Science, Design
Technology and Art classes
Learning Outcomes
GCSE Chemistry - Smart Materials: Light
Reactive
Top Tips
Reactive to Natural UV Light or a lamp.
Takes around 60 seconds for the solution to
return to its original colour.
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