Blue sky

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Please help!

We are putting together a blue sky interactive for an exhibition about
colour. Using milk powder is not suitable because the display has to
last at least a couple of weeks without changing the water, and we don't
want the exhibition to smell like a cheese factory!

Is there a less perishable alternative to milk powder? I have tried some
food additives but the blue effect is not as clear and a sulfur colloid
which diappeared.

Peter Ampt
Australian Museum
petera@austmus.gov.au

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