How do I make this "not hit" function work properly?

I made this script inside a part, that when touched, it becomes invisible, and when not touched, it appears again.

When I touch it, it turns invisible, but it stays like that even when I'm not touching it.

script.Parent.Touched:connect(function(HIT)
	local H = HIT.Parent:FindFirstChild("Humanoid")
	if H then
		script.Parent.Transparency = 1
	elseif not H then
		script.Parent.Transparency = 0
	end 
end)