You can mix in some white paint - but if you run short there is no way to make more. Color matching with a computer is only close - and not many people can match by hand anymore.

Why not just buy more paint in a lighter color of yellow?

Mr. Paint

Welcome Michelle,

We've had rather poor results trying to make paint lighter by adding white. We tried once with what my wife thought would be a nice shade of pink (it ended up about the color of strawberry ice cream). We kept thinning it; it got lighter but not nearly enough.

We ended up buying the right shade anyway (and eventually lost interest in pink altogether).

All in all, it turned into far too much painting...and thinning didn't work for us.

Good luck,
k

A better thing to do is go to a paint store and have them fix it the correct way and have them write the formula on the paint can you have this way you know what you have in case needing it for later use the formula will be written on the can,thus eliminating just adding white and guessing.
The formula they use for you will always be easily ready anytime you need it.
This would and is the easiest for you besides buying more paint.
By the way you hopefull yaren't using a Gloss paint,if you are or semi-gloss,this could be bright too (shiny)

The paint store will not be able to lighten it enough to make a difference as I have worked for a paint manufactuer for 28 years I have never been able to lighten a yellow in the store with colorant enough to make a difference. It has been my experience with yellows it takes an equal amount of white paint to lighten it up enough to make a difference. It is done all the time and just be sure you have enough to finish the job but with the extra white paint added that should not be a problem. If you run out and are dealing with a paint store and not a home center they will be able to match by eye whuch is the way better than a computer any day.

Good luck.

Never tought of that,but just maybe they can lighten it just enough to her liking,that is my experience too that they can eyeball a color better than the computters too.

Thanks all for the insight. Took the can back to the store; they added a touch of glack/grey and some white and took alot of the edge off the brightness. Store suggested not using white in yellow as it doesn't cut the actual tone. If the surface area was much smaller or if it was just an accent adding white could be ok.

Finishd the job and it looks much better.

Thanks again.

I hope they wrote how much they put in on the can so this way if you need more the formula will be right their for them next time,they cannot eyeball this or get it right with a computer,everytime I need to add more of something the paint supplier always needs to add such as 1x-g would mean they added 1 oz of grey.
Thus next time I need the same color they have it right their as an exact match.