That's not a bad idea. I don't know if I have enough space to do that, but I'll certainly consider it.
The idea is to make a functional space, and the trouble is what's behind me - the laundry area. There's no practical way of sectioning that off, but I will sure try. Thanks for the suggestion!
To mount the plastic, I used a staple gun and put it through long, thin strips of plastic ribbon (maybe 3/4" x 1/8" and 8ft long). Staple the plastic sheets to the rafters between the darkroom and laundry areas. When you're done in the darkroom, you can roll it up to the ceiling, using short lengths of clothesline to keep it up till next time. Fleet Farm has everything needed for this.
A politician is a man who will double cross that bridge when he comes to it.