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  2. Permanent marker - Wikipedia

    en.wikipedia.org/wiki/Permanent_marker

    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 ...

  3. Unearth Your Next Hobby With These Expert-Recommended Metal ...

    www.aol.com/best-metal-detectors-uncover-buried...

    Scavenge for gold, coins, and other buried treasure with these metal detectors, including models from Garrett, Nokta, and Minelab.

  4. Direct part marking - Wikipedia

    en.wikipedia.org/wiki/Direct_Part_Marking

    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

  5. Fugitive pigment - Wikipedia

    en.wikipedia.org/wiki/Fugitive_pigment

    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.

  6. Assay office - Wikipedia

    en.wikipedia.org/wiki/Assay_office

    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 ...

  7. Philatelic fakes and forgeries - Wikipedia

    en.wikipedia.org/wiki/Philatelic_fakes_and_forgeries

    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.