porous: slightly pitted due to cleaning or chemical action.
PQ: abbreviation for Premium Quality.
premium quality: a coin that is above-average for the grade.
Porous
A coin with a rough or granular/pitted surface from oxidation.
Prf ...
porous
A description indicating a rough or granular surface, typically seen on pre-1816 copper coins.
premium quality ...
Porous - Having a granular surface as the result of oxidation, most frequently found with older copper coins.
Porous
A rough surface on a coin caused by a planchet in poor condition. Also caused by burial or other prolonged contact with contaminants.
Precious Metal
Gold, Silver & Platinum. As opposed to BASE metal. See also, METAL STRATEGIC.
Porous
Possessing a granular surface, resulting from oxidation, most frequently associated with older copper coins.
Portrait ...
Bosporous Kingdom, King Kotys I. Monogram of Kotys in the left field of the reverse.
8. Porous rims, usually seen on early date Liberty nickels. If severe can result in no-grade.
9. Although rare, an extremely poor strike can also be a negative factor.
SOME FACTORS WHICH RESULT IN A NO-GRADE: ...
1878, Fair, micro-porous surfaces, Good sells for $30.00, ours just, $10.50 ...
Comments: This is a well worn, porous example of the standard small planchet variety. On the obverse the area around the scales is quite weak as is usual on late strikes. The reverse is too worn to detect the die cracks.
The scarcest date is 1809, usually seen darkly colored and porous, a condition familiar to much of the series.
Sharpness of VF-30 but porous. Struck 65% off-center, cut down, and overstruck by dies for a 1797 Lettered Edge half cent, Breen 3a.
at and tied to eight reales pitted Having a rough surface due to loss of metal by corrosion planchet A piece of metal prepared for coinage with raised rims but as yet unstruck plugged Denotes that a holed coin has been filled porous ...
But authentic ancient coins often have surface porousity as well. Being able to tell the difference takes some experience with both real and fake ancient coins.
Medium yellow gold with slightly rough, porous surfaces. A so-called "seawater" example which was recovered at some unspecified time from a sunken ship. A few minor dents and scrapes are present, however, these are not distracting.
Because marble is sensitive and porous, it needs to be cleaned with a neutral cleaner solution and then polished dry. Scratched and dull surfaces can be revived with a marble restorer (available from janitorial supply stores).
Very micro-porous surface, but not rough. Device edges not as sharp as one would expect on a real specimen. Returned for refund, November 2007. Credit to Cliff Laubstein for discovering this piece and bringing it to my attention.
There are numerous VF-30 1793 large cents, for example, with porous or unattractive surfaces, which, while technically VF-30, do not bring as much in the marketplace as Fine-12 coins of pleasing appearance.
A poor attempt would be quite likely to ruin the coin leaving a porous and ugly surface.
24-21 mm. 6:00. 3.95 grams.
Crude, sharp-edged, porous, very corroded.
Some traces of letters.
/S C both clipped by edge of flan.
weak with most legend gone and figure weak, porous surfaces and some crystallization, not a pretty coin or a particularly nice example but it has a decent portrait and thus is a good budget example for this normally expensive coin, Fine/about Fine...
Septimius Severus, Æ30, (12.36g) Neocaesarea, Pontus, Laureate, draped and cuirassed bust right. / Tetrastyle gateway to the sanctuary of Ma/Zeus. SNG VA 126var. VG / F, porous black patina.
Text
Obv ...
GI3958 1810 Philip I: Billion 26 Tetradrachm of Antioch
$200.00
Obv. Rad. bust l.
Rev. Eagle stg. facing, wreath in beak
11.07 g
Sear GI 3958: BMC 518 slightly porous, oth. EF ...
343 VALENTINIAN I. 364-375. Æ3 of Siscia. Bust right/Emp. dragging captive & holding labarum with chi-rho, BSISCV in ex.. SR-4102. VF, bit porous $30
343a---Æ3 of Constantinople, CON* in ex. Vf, nice patina. $35 ...
Seawater UNCS (gold coins recovered from wrecked ships; these typically show no wear, but surfaces are granular or porous) are known of this date.
A Large cent which grades but VF may well be considered more desirable and valuable than an EF grade coin that has porous surfaces. A beautifully toned EF coin may be worth more to many collectors than a dull AU example.
granular - used to describe a porous appearance or surface, often visible under slight magnification.
 See also: Coin, Reverse, Revers, Struck, Slight
  
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