What it does
Checks for uses of
Color3.new where the arguments are not between 0 and 1.
Why this is bad
Most likely, you are trying to use values of 0 to 255. This will not give you an error, and will silently give you the wrong color. You probably meant to use
Color3.new(255, 0, 0)
This lint is only active if you are using the Roblox standard library.