1 and providing sufficient time for a molecular matrix to be formed between the top coat 10 and the intermediate layer 8 thereby ensuring good adhesion therebetween the protective top coat 10 further includes a uv screen to block uv light that could otherwise have a deleterious effect on the colour stability of the intermediate layer 8 subsequently the cover is conveyed into an oven 11 where it remains for around thirty minutes or so at a temperature of around 60 u00b0 c to 70 u00b0 c before being dumped from the conveyor in to a collection bin not shown the visual effect resulting from the above described method is best understood by reference to fig3 an exemplary light ray 12 is shown leaving a source of light 13 that may be natural or artificial the light ray 12 passes through the transparent top coat 10 through the intermediate layer 8 where the light is filtered by the dye contained therein and is reflected by the particles 4 contained within the base coat 6 the reflected ray 12 then passes once more through the intermediate layer 8 where it is once again filtered before passing through the top coat 10 to reach a viewer 39 s eye 15 the visual effect resulting from the filtering and reflection of light incident on this finish is of intensely coloured anodised aluminium it will be appreciated by those skilled in the art that the above described embodiment is only one method of obtaining an intense colour surface coating in particular.