What do blocks use to gain a new color?

local a = game.Workspace.Part

a.BrickColor = BrickColor.new("Really red")

that will make it really red.

Parts use brickcolor. If you still want to use Color3, then use this code: game.Workspace.Part.BrickColor = BrickColor.new(Color3.new(123, 212, 192)) However, there are other ways. game.Workspace.Part.BrickColor = BrickColor.red() Makes it Bright red. game.Workspace.Part.BrickColor = BrickColor.new("Bright red") You can change that to any color from the paint tool. game.Workspace.Part.BrickColor = BrickColor.new(21) There are a lot of other colors not usually available. 21 is the code for Bright red. If you want to know all of the others, you can find them here.