US Patent 3,498,737 (granted 3 March 1970) describes a chemical finishing process that turns machine-made flat lace into sculptured, relief-textured lace. Cellulosic lace is soaked in sodium hydroxide so that open areas shrink more than dense areas, then crosslinked with dimethylol ethylcarbamate for dimensional stability and easy care. The document includes two sheets of drawings, a detailed description of the process steps, nine examples with toughness, growth and shrinkage test data, and two claims.