| http://www.w3.org/ns/prov#value | - b. at least one dichroic colouring substance selected from the group of compounds consisting of: ##STR6## wherein R3 is straight-chain C1 -C12 --alkyl and R4 is straight-chain C1 -C4 --alkyl, Z1 is hydrogen or chlorine, one of the symbols Z2, Z3 and Z4 is chlorine and the other two are hydrogen, and Y1 is hydrogen, Y2 is an amino group and Y3 is methyl or Y1 is hydroxy and Y2 and Y3 are hydrogen.
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