red chalk on quilt
 

How to get red chalk out of a quilt?

Depends on the product. Usually there are removal instructions on the packaging, did you keep it?

Have you Googled it? There are different things you do according to whether it is on a colored fabric or white. I've had trouble with blue tailer's chalk on white fabric before....long before there was an internet. I used dishwashing soap on white fabric, then bleach cleaning solution. It took several washings.