Our senior center quilting group received a donation of quilt blocks..signature type,with elaborate hand embroidery. Some are dated from 1851 . The embroidery section is done on very thin,open weave white cotton( you can see through it.). In order to sew the blocks into a top,the embroidered section need an appropriate stabilizer/ backing. What would you recommend. Of course it will be hand quilted and put in a local museum. Thanks .