why wont this change the all the parts brickcolors at once to different colors?

while true do
    wait(1)
    print("working")
    for i,v in pairs(script.Parent:GetChildren()) do
        wait()
        if v:IsA("Part") then
            print("still working")
            if v.BrickColor == BrickColor.new("Really blue") then
                v.BrickColor = BrickColor.new("Really red")
                print("red")
            elseif v.BrickColor == BrickColor.new("Really red") then
                v.BrickColor = BrickColor.new("Lime green")
                print("green")
            elseif v.BrickColor == BrickColor.new("Lime green") then
                v.BrickColor = BrickColor.new("Really blue")
                print("blue")
                if v.BrickColor == BrickColor.new("Really red") then
                    v.BrickColor = BrickColor.new("Lime green")
                    print("green")
                elseif v.BrickColor == BrickColor.new("Lime green") then
                    v.BrickColor = BrickColor.new("Really blue")
                    print("blue")
                elseif v.BrickColor == BrickColor.new("Really blue") then
                    v.BrickColor = BrickColor.new("Really red")
                    print("red")
                if v.BrickColor == BrickColor.new("Lime green") then
                    v.BrickColor = BrickColor.new("Really blue")
                    print("blue")
                elseif v.BrickColor == BrickColor.new("Really blue") then
                    v.BrickColor = BrickColor.new("Really red")
                    print("red")
                elseif v.BrickColor == BrickColor.new("Really red") then
                    v.BrickColor = BrickColor.new("Lime green")
                    print("green")
                end
                end
            end
        end
    end
end

output blue red green meaning they all turn green