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![]() Rainbow Mix Swiss Chard 250 seed pk. US $5.95
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![]() Rainbow Mix Swiss Chard 500 seed pk. US $8.95
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![]() Rainbow Mix Swiss Chard 1000 seed pk. US $12.95
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![]() 300 Coleus Rainbow Mix Coleus SEEDS "non pelleted" US $3.45
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![]() Coleus - Rainbow Mix 10 seeds US $1.99
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Synthetic Colours Are Dazzling But Disturbing [USA Science and Engineering Festival: The Blog] (scienceblogs)
By Joe Schwarcz, Author, USASEF Expo Performer, AT&T sponsored Nifty Fifty
program speaker & Director, McGill University Office for Science and Society -
Montreal, QC, Canada
Thanks to chemical ingenuity we lead a colourful life. Synthetic dyes have
served up a feast for the eyes but they may leave us starving for good health.
Our reliance on these chemicals exposes us to a host of unnatural wavelengths
that can affect our body chemistry.
Until about a hundred and fifty years ago we had no choice but to rely on
natural dyes. If you wanted red, you had better know where to find a madder
plant. Blue came from indigo, purple from a type of mollusk. Why the different
colours? Let's just cast a little light on the nature of light.
Light from the sun is composed of all the colours of the rainbow, as is
readily demonstrated by passing it through a prism. Each colour represents a
different wavelength and since the different wavelengths are bent to a
different extent as they pass through the prism, we see a rainbow of colours.
The colour of any substance is determined by which of these wavelengths are
absorbed ...
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