This is the way I always do my labels but not all ink will set permanently unless the fabric has been treated.
I ALWAYS go over my printing with a permanent pen, several times, to make sure that the printing doesn't wash out.
And how do I know to do that, you ask? lol Yep, because I made a label, put it on the quilt, washed the quilt, and took it out of the washer with a blank label.