The Saturator is a machine built by MumboJumbo in Season 6, it was used to re-saturate skins after they became monochrome when the Hermit using the skin died in Demise. While it worked perfectly for some (e.g. TinFoilChef), it didn't for some, Grian's skin became slightly oversaturated, it also oversaturated FalseSymmetry's skin. Iskall85, despite never Demising so he never became monochrome, still used The Saturator, this made his suit rainbow colors, but his head was protected by his Dragon Head.
TinFoilCHef was the first to use the machine, for him it worked perfectly and turned his skin back to normal.
FalseSymmetry's skin became oversaturated with color, turning her hair lime, her jacket red-purple, her shirt orange and white striped and more.
Grian's skin became slightly brighter than usual, however, this wore off after a few episodes.
Despite not demising, Iskall85 used The Saturator, this made his suit rainbow colors, but his head was protected by his Dragon Head.
While JoeHills had a monochrome skin, he was also inverted, this caused the machine to turn into an inverted version of his regular skin. The Saturator also affected JoeHills' real-life self.
His skin turned into a "vampire", becoming red all over, as shown in both Iskall85's and MumboJumbo's videos.