Vintage Embroidery Floss

In the package of sewing goodies my darling mum-in-law sent me home with were an assortment of vintage sewing flosses. They are beautiful colors & very glossy.

I also wanted to show the neat wrapper.

Here are the pre-embroidery instructions:

Wash quickly in lukewarm water with ivory soap flakes, rubbing lightly between hands. Rinse in lukewarm water, squeeze water out. Allow to dry. Press under dam not wet cloth with moderately warm iron. Do not boil.

I want to use these, so I have to set aside time for this pre-embroidery ritual.

I believe the floss in the black wrappers must be boiled. I better find instructions online.