| 摘要 |
<p>A novel jigsaw puzzle is here disclosed which is characterized by meeting the following requirements: (a) a plurality of pieces being separably combined so as to form a flat plate, (b) letters, a picture or a pattern being offset on either surface of the flat plate, and (c) screen printing being made on predetermined parts of the offset letters, picture and pattern by the use of a luminescent material comprising 30 to 60% by weight of a fluorescent pigment and 70 to 40% by weight of a colorless ink. e</p> |
