| 摘要 |
1,237,504. Photo-lithography. FMC CORP. Aug. 8, 1969 [Aug.9, 1968], No.39753/69. Heading G2M. Acidic aqueous compositions for de-sensitizing pre-sensitized printing plates contain (1) a gum colloid (e.g. gum arabic), (2) sufficient H 2 O 2 to prevent foaming, (3) HF, and optionally (4) one or more other acids (e.g. H 3 PO 4 ). |
