These are usually very accurate and available from chemists and large supermarkets for about £7.

You can buy it from chemists - some also stock special 'poison kits' for emergencies.

They cost around £1.99 for 125ml from chemists everywhere.

Despite de Chancourtois' work, his publication attracted little attention from chemists around the world.

It costs £7.75 from large stores, good chemists and beauty salons around the country.

From chemists and health food shops at £4.99, we have to tubes for you to try.

If you have to go out, wear one of the approved masks, from chemists.

It costs £5.99 for 15ml, available from leading chemists.

Both products are available from chemists and department stores.

'We would like to hear from chemists about small scale uses for which no other chemical will do the job', Nolan said.