The company that makes Retayne got back to me. This is what they told me.
Hi, Sam!
Thank you for your interest in the products offered by PRO Chemical & Dye. Retayne is great used as a pre-treatment for commercially dyed fabrics that tend to bleed easily. This is done before the fabric is cut and pieced into a quilt, etc. As far as its safety around children, there is no data that indicates what might happen if they were to start handling and possibly chewing on the fabric like little babies might do. Fabric treated with Retayne needs to be cared for by washing in cool water, so any type of warm moisture may cause it to come off.
Please let us know if we can be of any further assistance.
Sincerely,
Vicki Jensen
Lab Manager
PRO Chemical & Dye