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Sorting plastic containers for recycling can be difficult: they are made from
different materials, could have stored toxic fluids, the labels may come off and
bar codes can be obscured by dirt. Now Aquasol of Ongar, Essex, says it has a
solution: a container stamped with coded patterns of blocks and spaces that show
what it is made of and what was in it (GB 2 326 003). So the label never rubs
off.