 The appeal to transparency makes it immensely plausible that visual experience represents external objects and their apparent properties. But as noted above, that weak representationalist thesis is not terribly controversial. What the transparency argument as it stands does not show, but only claims, is that experience has no other properties that pose problems for materialism. The argument needs to be filled out, and typically is filled out by a further appeal to introspection. The obvious additional premises are: (i) If a perceptual state has relevant mental properties in addition to its representational properties, they are introspectible. But (ii) not even the most determined introspection ever reveals any such additional properties.