Erst einmal nur auf englisch:

Papers and Phosphor

This applies mainly to the later Wildings and all Machins. Warning: Never look directly at a UV lamp when it is switched on.

Fluorescence is the reaction obtained under the UV lamp whilst it is switched ON. i.e. the stamp ‘glows’ while the lamp is on. Phosphorescence is the afterglow seen after the lamp is turned OFF. When determining either fluorescence or phosphorescence it is advisable to do so in a dark room and allowing your eyes to become accustomed to the light for about 5 minutes.You will also find it easier to look at the white - unprinted - or light coloured part of the stamp. To determine Fluorescence hold the lamp about 1” (25mm) above the stamp(s) and turn it on. The paper will fluoresce at a level dependant on the type of paper used. This is described more fully for each type of paper on the next page. For Phosphorescence a slightly different method is used. Place the lamp ON the stamp, turn it on and leave it for about 5 seconds. Then, at the same time, turn the lamp off and lift it away from the stamp. You will now see the phosphor (if present) glowing. It will take a little time and practice to identify each type of paper and phosphor used, but one useful idea is to obtain some known cylinder singles, or other examples, as ‘KEYS’ for comparison. This will make positive identification much easier and quicker. Papers can be checked under natural light and under UV light. When checking papers under natural light it is strongly advised that it is done under bright natural lighting conditions, but NOT direct sunlight. Artificial light can be used with care, but it often leads to incorrect conclusions.