, I usually write down the room and date on the can of paint , but writing it like that , is a good idea just in case you or the client don’t have the paint cans left.
Never really thought of doing this.
We ran into trouble with buying in 2 different Rona stores last fall for the rental property. We bought all the same color. We had to buy 3 cans of paint and one store and 2 at another store. They were tinted exactly the same. I had repaint a room because of this. Lucky I got the paint on sale.