A capsule-carrying sheet or web, e.g. a sheet carrying capsules containing a colour-reactant material for use in a pressuresensitive copying system, in which one surface of the sheet or web carries a coating incorporating the capsules, together with starch particles acting as a protection for the capsules against accidental rupture and a protein binder binding the capsules and starch particles together on the surface, both the starch particles and the protein binder being derived from a common milled flour source, e.g. by agitation of an aqueous suspension of the milled flour.