[mncharity]

Perhaps "transparent with a blue tint"?

[yawpitch]

I’ll allow “transparent with an occasional blue tint under the current conditions of its nearest star”.

[mncharity]

Does that confuse sales staff when shopping for clothes? ... :) The general observation being that sometimes educational descriptions of things get hedges which wouldn't usually be applied in everyday life. Yes, the nice red shirt will look black under some lighting, like some meters underwater... but it usually isn't mentioned. Yet for example, colors of unfamiliar objects in education content can get an "appears" hedge -"it appears white", rather than the more usual, simpler concept of "if its light looks white, it's 'white'".