it only reacts under UV light and when using it on porous surfaces like plastic

The size of this pad is 24 x 32 cm

and lasting colour

these refillable pens are compatible with water-based and alcohol-based inks

The Uni Chalk Marker PWE-8K Broad has a 8 mm chisel tip

ballograf epoca p ballpoint pen neon green hidden-product it only reacts under UVBallografs classic ballpoint pen that first was introduced in the early 60's. Timeless designed ballpoint pen available in several different colors, choose between the classic blue or the new, modern colors. The pen is delivered filled with blue ink, which is certified archive proof and each cartridge writes a total of 8000 meters. The pen is refillable and just like all Ballograf pens, you have lifetime warranty for the mechanical parts of the pen.