A process dating back thousands of years, in 1979 Shor
introduced the first turn key in-house fire assay systems to the jewelry
industry. These first systems purchased from Shor in 1979 are still in
continuous use and will probably continue to be used well into the 21st century.
The method known as "Fire Assay" is the oldest known
method of assaying gold and continues to be the most accurate and economical
method of determining the purity of gold. Capable of
precision down to 1 part in 10,000 the fire assay
system allows you to make up to 20 assays at once with a
cost as low as $1.00 per assay. This system can
easily and inexpensively be expanded to greater capacity. Every sample can
be assayed for gold content, platinum & silver content. The process
returns the sample as 999.99+% pure metal.
Many samples can be assayed at the same time. We
have separate procedures for both large and small batch sampling.
The
assaying system will fit onto a 3' x 5' (90 x 150 cm) table and includes all
equipment and supplies (except acid and water). The Shor Fire Assay
System comes complete with both written instructions that are updated
regularly and the transcript of a seminar given by Shor on assaying
(including questions and answers). Additional technical support is available
over the phone and/or fax at no extra charge.
Complete Shor Fire Assay System:$3,595
A brief description
of how fire assay works:
The sample of gold is weighed very precisely and the amount is recorded. The
sample is wrapped in assay lead foil along with a quantity of pure silver.
This wrapped ball is placed in the furnace in a cupel (a special kind of
disposable crucible). All the non-precious metals are absorbed by the hot
cupel. The precious metal forms a button within the cupel. The cupel is
removed from the furnace, from the cupel and then brushed to remove any
lingering bits of cupel. It is hammered flat, rolled thin and then heated in
a porcelain crucible containing a weak nitric acid solution. The acid
removes the silver, which is poured off and the silver recovered from
solution. The gold is then rinsed in distilled water to remove any residual
acid and then dried. The sample of gold is now at least 99.999 pure. The sample is then
weighed again. The original weight of the impure sample is divided into the
weight of the now pure sample. The result is the assay
Scratch testing is one of the oldest methods known to man for
testing the karat of gold. In experienced hands, a scratch test is
sensitive to within about +/- ½ karat or about 2%. In the hands of a
novice, sensitivity is more likely to be about +/- 1-2 karat.
Kits come complete with instructions
Gold Scratch Test Instructions
These kits are for testing
gold, silver and platinum. They come with gold test needles, wooden
case, test acids and a scratch stone.
Description
Stock #
Price
Complete Test Sets
Precious Metal Test Kit w/ 3 needles (10, 14, 18K)
TES-808.00
$56.90
Precious Metal Test Kit w/ 5 needles (8, 10, 12, 14, 18K)
56.0806
$109.95
Precious Metal Test Kit w/ 9 needles (4, 6, 8, 10, 12, 14, 18, 20K)
56.700
$129.95
Needle Sets
9
Test Needle Set 4, 6, 8, 10, 12, 14, 18, 20 Karat
Electronic gold Tester are a fast and easy way to test gold. They have the
advantages of:
Speed
Accurate, sensitive readings even when
operated by a novice. Sensitive to within ½ karat or 2%.
Nondestructive- the surface of the piece
being tested does not become marred by a scratch
Builds confidence with your customer- the
karat reading is easily demonstrated to your customer.
Electronic Test Stone & M Series Electronic Gold Testers
Electronic Touch Stone-
For slightly more than the cost of an acid test kit, the ET18 precisely
determines gold karat values equal to or greater than 10K, 14K and 18K.
Pocket sized and battery operated. One year warrantee.
M24- These
are some of the most advanced gold tester in the world. Precisely
determines gold karat values equal to or greater than 9K, 10K, 12K, 14K,
18K, 20K, 24 K. Battery operated and are warranted for two years.
These electronic Tester operate on
ordinary household current and can also be run on batteries (requires
two 9 volt batteries, not included). Replacement consumables include
the conductive gel tube and the Pro cleaning solution.
We carry 2 different categories of electronic Tester:
Direct Reading electronic Tester and
Chart Reading Tester.
They all work similarly.
Direct Reading GXL
Electronic Gold & Platinum Tester- These
testers give you a direct L.E.D. reading of what
the karat is. So, for example, if the karat
of jewelry you are testing is 14K, it will show "14K" on the L.E.D. display.
This can be quite useful when buying jewelry from the public or when, when
selling, you feel the need to show customers that the karat stamped on your
jewelry is the true karat.
The GXL electronic Tester come complete with
written instructions.
Chart Reading GT
Electronic Gold & Platinum Tester-
To use these Tester, you must compare the numerical L.E.D. reading with a
chart that is printed on the tester. These Tester have two advantages; They
are somewhat more sensitive than the Direct Read Tester and they are also
significantly less expensive. Their disadvantage is that you have to look at
a chart to get your result.. The GT electronic
Tester come complete with written
instructions.
Description
Range
Voltage
Stock#
Price
Direct Reading GXL-18
6-18 K
Battery (optional adaptor available in 110v or 220v)
56.762
$599.99
GXL-18 Gel
56.766
$17.55
Direct Reading GXL-24 PRO
6-24 K, Platinum
Battery ( optional adaptor available in 110v or 220v)
56.763
$723.75
GXL-24 Gel
56.767
$17.55
GT & GXL Cleaner
56.769
$12.20
Chart Reading GT-3000
6-18 K
Battery ( optional adaptor available in 110v or 220v)
56.782
$273.75
GT-3000 Gel
56.766
$17.55
Chart Reading GT-4000
6-24 K, Platinum
Battery ( optional adaptor available in 110v or 220v)
56.785
$484.99
GT-4000 Gel
56.767
$17.55
GT & GXL Cleaner
56.769
$12.20
Consumable Supplies for Electronic Gold & Platinum Tester
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