ขาย กระดาษคาร์บอนสีดําขนาด A4 100 ชิ้น / ชุดสําหรับติดตามกราไฟท์ ราคาที่ดีที่สุด

Size: A4, 21*29.7cm product description: -A paper with an acidic developer on the front and microcapsules containing a colorless leuco dye on the back. When the paper overlaps, the microcapsules rupture due to mechanical pressure, and the colorless leuco dye overflows and develops color when exposed to acid. Form an image. -This paper can be used for multiple overlapping and used as bills. -The coating surface is uniform and bright. -The copying effect is clear, the lines are continuous, and the copied font is a blue font, which can be used repeatedly