Challenge has finished
A publisher needs an image suitable for the cover of a high school chemistry book. The client imagines beakers and test-tubes but is equally interested in images of elements and compounds. The most important consideration is that the book not be confused with physics, biology or geology.
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Wednesday, 4th September, 2013 (GMT)
Wednesday, 11th September, 2013 – Tuesday, 17th September, 2013 (GMT)
Wednesday, 18th September, 2013 – Tuesday, 24th September, 2013 (GMT)
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A litium salt (on the tip of an inert rod) heated on a flame, emmits a bright red light, the so-called "Lithium line" in flame spectrosopy.
|Submitted:||Sunday, 15th September, 2013 22:29 (GMT)|
|Taken:||Saturday, 8th August, 2009|
|Focal length:||60 mm|
|Shutter speed:||1/2 sec|
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