Soap Stamp for Cold Process SoapsTurn simple soaps into extraordinary just by stamping them! Material: acrylic, with plastic case Suitable for: cold process soaps To use: Use a rubber mallet (or your hand) to gently tap (or press) the acrylic stamp on the soap. Make sure to tap all the corners and the center to ensure you'll get the complete design. We like to stamp our soaps at least a day after un molding and cutting though it would depend on the water discount and formula you use.