Volcanic Pumice Stone Rock Abrasive 90+ Y/O Ad Trade Card

Description

Volcanic Pumice Stone Rock Abrasive 90+ Y/O Ad Trade Card
NOTE:
THESE ARE NOT POSTCARDS
THEY ARE TRADE/ADVERTISING CARDS.
THEY ARE MUCH SMALLER THAN A STANDARD POSTCARD
AND
THERE IS ADVERTISING TEXT ON THE BACK!
THE CARD DIMENSIONS ARE APPROXIMATELY
2 5/8 '' x 1 3/8 ''  or  6.5 cm. x 3.5 cm.
THIS IS AN ORIGINAL 90+  YEAR OLD TRADE  ADVERTISING CARD
THE SUBJECT OF THIS CARD IS:
PUMICE VOLCANIC ROCK
Pumice, called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular
rough textured volcanic glass, which may or may not contain crystals. It is typically light colored.
Pumice is created when super-heated, highly pressurized rock is violently ejected from a volcano. The
unusual foamy configuration of pumice happens because of simultaneous rapid cooling and rapid
depressurization. The depressurization creates bubbles by lowering the solubility of gases (including
water and CO2) that are dissolved in the lava, causing the gases to rapidly exsolve (like the bubbles of
CO2 that appear when a carbonated drink is opened). The simultaneous cooling and depressurization
freezes the bubbles in a matrix.
Pumice is widely used to make lightweight concrete or insulative low-density cinder blocks. When used
as an additive for cement, a fine-grained version of pumice called pozzolan is mixed with lime to form a
light-weight, smooth, plaster-like concrete. This form of concrete was used as far back as Roman times.
Roman engineers used it to build the huge dome of the Pantheon and as construction material for many aqueducts.
It is also used as an abrasive, especially in polishes, pencil erasers, cosmetic exfoliants, and the
production of stone-washed jeans. "Pumice stones" are often used in beauty salons during the pedicure
process to remove dry and excess skin from the bottom of the foot as well as calluses. It was also used
in ancient Greek and Roman times to remove excess hair. Finely ground pumice is added to some
toothpastes and heavy-duty hand cleaners (such as Lava soap) as a mild abrasive. Pumice is also used as
a growing substrate for growing horticultural crops. Some brands of chinchilla dust bath are made of
powdered pumice.
NOTE:
THE REVERSE SIDE HAS TEXT ABOUT THE IMAGE ON THE FRONT SIDE
THE CARD DIMENSIONS ARE APPROXIMATELY
2 5/8 '' x 1 3/8 ''  or  6.5 cm. x 3.5 cm.
NOTE:
THE IMAGE ABOVE IS LARGER THAN THE CARD
TO SHOW THE DETAIL.
SEE SCALED IMAGE ABOVE.
THIS CARD IS NOT A MODERN REPRODUCTION
THIS CARD IS 90+ YEARS OLD
IT IS NOT PERFECT AND THIS CARD MAY HAVE
SLIGHT PAPER LOSS
SMUDGING
ROUNDED CORNERS
SURFACE CREASE
SEE THE IMAGES ABOVE!
38
WE COMBINE SHIPPING
BUY 1 TO 4 TRADE ADVERTISING CARDS AND THE TOTAL TO SHIP IS
BUY 5 TRADE ADVERTISING CARDS AND SHIPPING IS FREE
NOTE:
ON LARGER INTERNATIONAL ORDERS WE MAY REQUIRE REGISTERD
MAIL AND WILL SPLIT THE COST WITH THE BUYER.
INQUIRE IF CONCERNED!