Blog post about picking off white paint
I posted this in the kitchen and home decorating forum too.
It can be a major source of frustration. You Google 'til the wee hours of the morning, should I do White Dove, Mayonnaise, Cloud White, Marscarpone, Blah, Blah, Blah. Megan from Frugal Farmhouse Design posted about how she picks off whites. This is probably one of the most informative. I never would have thought to have the store print out the formula. Based on the tints, you can better determine which undertones it will have. Or maybe, narrow the field WAY down. I've been buying samples and have a list of samples I want as long as my elbow. Don't even ask me how much I've spent so far, LOL! So, take a look.
Here is a link that might be useful: Frugal Farmhouse Design off white paint