When my husband paints a room, he removes the light switch plate. Writes the brand of paint and the color under the light switch plate. When he is done painting, I cover the writing with the light switch plate. If you ever need to get any more of the paint for that room, just remove the switch plate cover and you have all the information you will need. I can't rely on my memory anymore, so this really works for us.
By dorothy wedenoja from New Creek, WV
This page contains the following solutions.
As a result of buying the wrong paint, I developed a system for touch up paint. I now keep a paint chip card in each room. I also keep a duplicate of each in my calendar book as well, to have with me should I be shopping and see something to know if it would match or not.