I don't know the answer either (looked it up in Hargrave's "Fiber to Fabric"
and it wasn't mentioned). But I'd be interested to know whether the piece
was washed or not. Is it possible for all the sizing etc. in "factory fresh"
fabric to react to the heat of the iron and change the color?

If you read through the above book, it describes the process and qualities
of the various dyes used on fabric. Obviously, heating the dye, even when
it's dry on the fabric, will change the chemistry enough to alter the color
in some cases, but IME the original color always came back. But I pre-wash
everything.
Roberta in D

"SMark" schrieb im Newsbeitrag
news
I have a question. I did a google search and can not find my answer.

I have noticed that when I iron some of my purple pieces, the fabric will
change color. Most of the time, the purple comes back, except yesterday
ironing a Debbie Mumm piece, the color did not come back. Why does this
happen and should I use these pieces in my quilt or should I discard these
pieces as inferior?

Thanks!

Sandi M.