50.5 MB (4.6 MB compressed)
5150 x 3424 pixels
43.7 x 29.0 cm ⏐ 17.2 x 11.4 in (300dpi)
GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Melting sulphur, 1 of 4. A test tube with powdered sulphur, S, is placed over a Bunsen burner flame. When heated, it first melts to a straw-yellow liquid and then darkens to a red-brown colour.
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