overlaid with fibres a web of dry laid and bonded viscose fibres was slit into continuous strips 4 22 mms wide at regular intervals discs 14 of paper each having a central aperture 14a were bonded along the length of the strips with a polyvinylalcohol adhesive as shown in plan view in fig6 each paper disc 14 was 15 mms in diameter and contained a central hole 5 mms in diameter the discs were printed in multiple colours and coated with silicone the strip was run into a papermaking machine so that the strip lay in the centre of the section of the paper it was found that the annular area of impermeability provided by each disc had prevented fibre deposition thereon and fibres which had temporarily adhered were easily washed off the silicone coated discs as the paper left the forming zone of the machine the discs were therefore strongly bonded to the paper at their edges and at the central hole but the striking printed colours on the surface of each disc were directly exposed to view fig7 and 9 illustrate three strips for use in the invention made by laminating two continuous strips one permeable and one impermeable together in each case a permeable base strip 1 bears a ribbon 12 of impermeable material such as plastics film or metal foil bonded thereto for instance the strip may be of 12 micrometer polyester film metallised on one side ribbon 12 is cut to have a varying with and.