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Permanent markers are used for writing on metals, plastics, ceramics, wood, stone, cardboard etc. However, the mark made by them is semi-permanent on some surfaces. Most permanent marker ink can be erased from some plastic surfaces (like polypropylene and teflon) with little rubbing pressure. They can be used on ordinary paper, but the ink ...
Scavenge for gold, coins, and other buried treasure with these metal detectors, including models from Garrett, Nokta, and Minelab.
Highly polished metal surfaces should be textured to reduce glare prior to marking. The textured area should extend one symbol width beyond the borders of marking. Part Size When a 2D Symbol is used, the size of the part is not a relevant factor as the available marking area is reduced to below 1/4 inch square. Operating environment / age life
1887 British Consular Service revenue stamp printed in green fugitive ink. Fugitive pigments are impermanent pigments that lighten, darken, or otherwise change in appearance or physicality over time when exposed to environmental conditions, such as light, temperature, humidity, or pollution.
Assay offices are institutions set up to assay (test the purity of) precious metals. This is often done to protect consumers from buying fake items. Upon successful completion of an assay (i.e. if the metallurgical content is found be equal or better than that claimed by the maker and it otherwise conforms to the prevailing law) the assay offices typically stamp a hallmark on the item to ...
One would imagine that overprints should be easier for a forger to falsify. It is just a simple matter of applying a few letters to a stamp with black ink. Paying attention to detail can reward a philatelic sleuth. The stamps of Bangkok from the 1880s were produced by overprinting each stamp a single letter "B" on stamps of the Straits Settlements.