The Blackness Triptych

Not a sextet! A triptych of three version of the same stereoscopic cross eye view pair taken in the Stedelijk Museum in Amsterdam. The Blackness? That was an early [fictional] example of black popaganda so old that clips of this BBC children's TV SF/thriller series no longer exist! In brief a 'phenomenon' that turns people black is being unwisely investigate by the local children; but what ius it? An urban myth? a threat from outer space? ...orare the adults involved in something they don't want the kids to know about. They're certainly acting very paranoid.... anyone else know anything about this?