Better plan!
I have some crocheted lace doilies that my great-grandmother's sister made - probably circa 1900. They were yellowed and I used the weak tea stain thing on them. Now they have a much more pleasing appearance IMO. I know they started out snow white, but there was no getting back to white. And as you say the yellow was spotty also. The tea stain gave me a consistant color that is antiquish looking. Not only does it look nice but they go well with the furniture I have.