“But surely there is a case in which I'm justified to say “I see red”, where I'm not lying, & one where I'm not justified in saying
so
this
!” Of course I can be justified by the ostensive def. or by asking the others “now isn't this red?” & they answer that it is. But you didn't mean this justification, but one
which
that
justifies me ˇprivately whatever others will say.