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Broadside Attack. Generally accepted corrosion theories, testing and anti‐corrosion practices had their backs to the wall last month under attack from Dr. J. B. Harrison of Goodlass Wall at the Oil and Colour Chemists' Association meeting in London. Most heavily under fire was the current accelerated corrosion salt‐spray testing practice. No wonder, says Dr. Harrison, there is such widespread discrepancy between results from accelerated tests and the actual long‐term corrosion results. The devil, apparently, is ammonium sulphate contamination, and ammonium sulphate has no place in existing accelerated testing. The accelerated testing conducted by Dr. Harrison in the light of the new theories had both borne out the theories and proved the need for different tests.