Event when a block changes color?

You can use the GetPropertyChangedSignal, much like Changed, it Fires when a property was changed; however, this Signal allows you to narrow itself by passing a specific Property you desire it to Fire for on alternation. Pass 'BrickColor' as the specified property, and it'll Fire the Listener accordingly

local Part = workspace.Part

Part:GetPropertyChangedSignal("BrickColor"):Connect(function()
	print(Part.Name.."'s BrickColor changed!")
end)

Hope this helps! If so, forget to accept this answer! Have a nice day,

Feahren.