All chemicals used in this investigation were reagent-grade chemicals, they were used without purification. Zinc nitrate (ZnNO3)2 was provided by Sigma–Aldrich, Germany whereas hexamethyltriethylenetetramine (HMTETA) was purchased from Sigma–Aldrich Chemie GmbH, USA.
Mill desized-scoured-bleached cotton fabrics were kindly supplied by Masr Company for Spinning and Weaving, El-Mehallah El Kobra).