In your innocence, you thought Dr. Boli was being facetious when he listed a number of upcoming articles whose topics sounded duller than anything even he would be willing to publish. Yet you underestimated him, in your innocence. Through the courtesy of the Bedfordshire Record Office, a short film from 1970:

And that says all there is to say on that topic. Yes, there are many, many videos on the Internet about marbling paper. But is there another with that distinctive produced-by-a-county-council-in-1970 aesthetic?