how do you change the colour of a block when another block is touched?

hi, the last thing blocking me from finishing my game is that i don't know how to have 1 block change colour when a different block is touched. for example if i have block A and block B, i want block B to change red when i touch block A. i hope someone knows how to do this. i tried doing it on my own, here is my code:

function onTouched(hit) if hit.Name=="check1" then script.Parent.BrickColor = BrickColor.new("Really Red") end end script.Parent.Touched:connect(onTouched)

i hope this was understandable, thanks from poopypigeon245.