No color was appeared in the test line and control line board paper position, or only a red line appears detection strip and strip control line does not appear.
There are no red stripes in the test board detection line and the mass control line position, or only a red strip appears in the detection line and the control line does not appear.
There is no red strip in the test line and quality control line of the test paper board, or only one red strip in the test line and no strip in the quality control line.