You can imagine how my eyes were drawn to these pieces of iridescent
glass on the foreshore. They have a magnetic pull on the eye. However, it
is likely that this glass did not begin life with this wonderful oil slick
effect. Iridescence is caused by interference effects of light reflected from
several layers of weathering products. What you end up with is a rainbow-like
effect that changes according to the angle from which the glass is viewed, or
the angle of incidence of the light source.
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| Mudlarking find: iridescent glass fragments |
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| Mudlarking find: iridescent onion bottle neck |
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