are based on water-borne systems the pens can be used for marking and work better ... are milky-white solutions and ventil-pens/pump-pens are filled with the ink ... adheres well to the surface under uv-light 366nm the marks are easily visible and ... shine in green or red the uv-ventil-pens can be refilled the inks to refill are ... 250ml or 1000ml cans the heads of the pens which can also be replaced can be ... caution protect against frost ink and pens shake well before use please test ... are based on water-borne systems the pens can be used for marking and work better ... is clear and is filled in a textilan pens the ink adheres well to the surface ... under uv-light 366nm the marks are easily visible and ... shine in blue or green the uv-pens can be refilled the filter writing head ... and cap of the pens which can also be replaced can be ...