A laboratory autography marking pen capable of delivering a low viscosity
phosphorescent marking ink that contains a homogeneous suspension of
phosphor particles having an average particle size of between 10 and 40
microns, and whose afterglow half-life is less than 5 minutes. The marking
pen further includes a high porosity fiber channel writing nib whose ink
flow channels are of a sufficient size to allow the phosphor particles
suspended in the ink to flow by capillary transport through these channels
onto an ink receiving substrate material.
