Download Safety Data Sheet The basics A safe washing concentrate for silk fabrics, treasured needlework and quilts. The benefits Quilter's Rule Quilt Soap paste contains no phosphorus to harm delicate fabrics. The surfactants in this soap are biodegradable.  The pro tip Works wonderfully on quilts, even very delicate antique quilts. Follow manufacturer instructions for best results.  The bottom line Improved formula with no dyes, additives or water. Biodegradable, highly concentrated, and very economical. 8 oz jar.