| 摘要 |
PCT No. PCT/EP90/02326 Sec. 371 Date Jun. 29, 1992 Sec. 102(e) Date Jun. 29, 1992 PCT Filed Dec. 28, 1990 PCT Pub. No. WO91/09548 PCT Pub. Date Jul. 11, 1991.Buttons or similar products in vegetable ivory undergo a first base dyeing, are then covered in preset areas with a temporary protecting film, and submitted to a second dyeing; the protecting film is eventually removed to obtain a multicolor product.
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