In another memorable moment, the 1986 "Enemies and Paranoia" episode used the word "Free" as a trigger phrase for red slime after the studio was taken over by Russian Communists. Other infamous non-green slimings include; Vanessa getting orange slimed in the "Myths" episode, Lisa having brown slime dumped on her in the "Cosmetics" episode, and Chris being black slimed in the "Time" episode. On the show, the recipe for the green slime was treated as a closely guarded secret, with attempts by the kids to find out the true recipe all being unsuccessful. In one episode, Ross (Les Lye) even went so far as to decoy the kids with a fake recipe), although some episodes posited revolting theories as to what the slime was really made of – one 1989 episode which dealt with smoking, for example, theorized that slime was mucus from smokers' lungs, and others frequently inferred that it was sewage. While the original recipe consisted of rotten food, after continued complaints from the cast, the recipe for green slime was changed to a more innocuous mixture of lime green gelatin powder, oatmeal, and water. Eventually baby shampoo was added to the recipe so that it would wash out of the actors' hair more easily after several of the female cast members complained. In the aforementioned 1982 episode "Television," Christine revealed the ingredients to the green slime, confirming all of the previously stated items. In later years however, the recipe consisted of simply adding green food coloring to a bucket of cottage cheese, which had the side effect of spoiling if left too long under hot studio lights (Vanessa complained of its smell almost making her sick after her sliming in the 1987 'Worst Of You Can't Do That On Television'). Especially in the later years of the show, cast members who were slimed frequently looked upward into the slime as it was falling so that it covered their faces (the same was also true of the waterings). To avoid damage to the set from water or slime, a clear tarpaulin was placed over the main portion of the set for scenes in which an actor was to be hit with either. The tarpaulin can occasionally be seen and/or heard underneath the actors in these scenes, and in fact the loud splatter sound usually heard during a watering or sliming is due to this tarpaulin. Actors who were scripted to be slimed or have water soaked on them usually appeared barefoot in the scene, and several cast members who were slimed were reportedly paid extra.