Twards black and white masking paper, model number 1A1B, black on the top and white on the bottom, including overlay varnish and unvarnished varnish, which is convenient for test comparison.
| Model | color | Dimensions (mm) | type | Quantity per box (sheets) | brand |
| 1A | On 1/3 black(Varnish), Medium 1/3 white (overcoat varnish), Lower 1/3 white (no overcoat varnish) | 140x254 (5-1/2x10 inches) | Overcoat varnish and unvarnish varnish | 250 | LEADER |
| 1B | 194x289 (7-5/8x11-3/8 inches) | Overcoat varnish and unvarnish varnish | 250 |
Blocking force jam: Measure the hiding force with an instrument
Permeable cardboard: Used to evaluate the consistency of color and gloss of a voided surface
Visual assessment of hiding power:
- Comparison/coating rate jam
- Black and white grid/coating rate cardboard
Brush cardboard is used for informal brushing
Dedicated test jams for sag and leveling tests.
Sealed refers to the fact that the cardboard part contains varnish and is not easy to penetrate
Unsealed means that the cardboard part does not contain non-overprint varnish and is permeable

1A 1B