Unprinted kraft paper grocery bags will do. Put your iron on a warm setting without steam. For a watercolors suitable for framing, try taping down your paper to a board. Apply strips of white artist's tape evenly along all four sides. Stamp and watercolor and allow it to dry completely before removing tape.
White edge looks great and gives area for matting.
A deckled edge piece is beautiful to mount on a dark background. Hand-stamped originals may be sold. Inc. All rights reserved. This entire web site and its contents are copyrighted.