Â鶹´«Ã½

Letter: Clean air acts

Published 19 August 2000

From D. Billin

Your Technofile item states that tannin cleans air
(22 July, p 11).
Is that how pot-pourri works?

Carshalton, Surrey

Issue no. 2252 published 19 August 2000

Â鶹´«Ã½ issue 2252 cover

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