หมึกล่องหนขนาด 18 มล. มองเห็นได้เฉพาะภายใต้แสง UV สำหรับเขียนข้อความลับ

Features: Invisible ink can only be seen under the irradiation of lamp You can use glass pen, pen, feather pen Great to draw or keep a diary You can also use it to record some important things, such as passwords or other things, which others find and think are blank Widely used for writing, drawing, art craft. Specifications: size: 18ml One Size Length:6.6cm(2.6in) Width:3cm(1.18in) Height:3cm(1.18in) Package Includes: 1Piece Invisible Inks note: 1.Please allow 0-1cm error due to manual measurement. make sure you donot mind before bid. 2.Due to difference between different monitors, the picture may not reflect the actual color