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Mr. Gapes
To ask the Secretary of State for Transport if he will ban the use of sodium hexacyanoferrate in road salt.
Mr. Kenneth Carlisle
The rock salt used on the Department's motorways and trunk roads complies with British standard 3247, which stipulates the use of an anti-caking agent. The anti-caking agent currently in use is sodium hexacyanoferrate and I have no plans to discontinue its use.