Rare Antique~Henry Gardner Color Standards For Liquids~1933 Gardner Comparator

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Rare Antique~Henry Gardner Color Standards For Liquids~1933 Gardner Comparator:
$945.00

Old School Warehouse

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Rare Antique Laboratory Instrument\"Color Standards for Liquids\"
Made By
Henry A. Gardner Laboratory Washington D.C.
Circa 1920\'s
listing includes 12 extra
Color StandardsTubes (marked with letters)
This is anExcellent example of one of the very hard to find first Henry Gardner Color Standards made, That set the industry standard referred to in ASTM D-1544
Also knows as the \"1933 Gardner Standards\"The Henry Gardner Color Standards were first made in the 1920\'s by Henry A. Gardner Laboratory Inc. Washington D.C.This instrument measures 23 1/8\" Long x 5 3/4\" Tall x 2 1/2\" DeepThe Color Standardsfor Liquids instrument
consists of a sturdy BlackMetal Rack mounted on a Wood Base. In this baseare18 Sealed glass tubes of colored fluids.
These tubes are in numbered positions on the base. Empty spaces between these positions allow the placing of a tube filled with a sample solution between two adjacent standards, to assist in comparing color.
A panel of frosted glass fixed into the instrument behind the tubes serves as a background of diffuse white light when viewing the tubes.
Sunlight from a wondow was the comon source used, but an artificial light source was also at times used.A rareearlyinstrument and one of the first of it\'sera.
It isin excellent condition as found condition,with all of its earned aged character,wear and scuffs on the wood base.
Instrument Comes with 12 extra color vials (see pics)MORE INFORMATIONON COLOR STANDARDSHISTORY
(Referrence from BYK.COM)
Because liquid color standards first appeared over 50 years ago some old sets are still available and in use whose colors do not exactly agree with each other, a brief history of the Gardner Liquid Color Standards will be helpful.
In the 1920‘s, several sets of colored liquids were developed for use in describing the colors of varnishes, oils, resins,nitrocellulose laquers, fatty acids, polymerized fatty acids, and similar transparent colored liquids.
Of these, the most widely used was a set made of ferric chloride and cobalt chloride dissolved in hydrochloride acid, which was developed by Henry A. Gardner.
These standards described in ASTM D1544
which is theMethod of Test of the fore mentioned liquids,as well as similar transparent colored liquids is widely known as
\"The Gardner 1933 Standards\"About the same time, the Hellige Company was marketing a set of glass disks with designations 1, lL, 2, 2L, etc. Later, the Hellige Company shifted over to marketing glass disks which presumably matched the
Gardner 1933 Standards
In the late 1940‘s, a committee of the Intersociety Color Council undertook the investigation of various sets of color standards for liquids.
As a result of this, a revision of D1544 was drawn up in which the lighter tubes (up to 8) were made with potassium chloroplatinate, and all colors were specified by the spectrophotometric color values rather than by composition. This was published as ASTM D1544-53. In the design of this specification, a serious effort was made to retain the colors described by D1544 and the Gardner 1933 Standards, since these had been widely adopted by the trade. Unfortunately, it turned out that three of the tubes (7, 8 and 9) were significantly lighter than the accepted colors of the 1933 Standards, so these tubes gave higher numbers than did the old tubes for oils in this range.
These tubes were adjusted to bring them into line with accepted usage, and a slight change was made in Tube #6 to equalize the spacing. This was published as a new method, DI544-58. However, continuing problems with production and standardization of the liquid colors at that time resulted in demand for glass disks as primary standards. The method was again revised to use glass disks whose color is specified spectrophotometrically as the primary standard. This revision was published as D1544-63 and describes the scale used in the Gardner-Delta Comparator (Catalog #CL-6750).
At the present time, both the liquid and glass standards meet the requirements of ASTM, DIN, ISO and other specifications.
The choice of instrument is principally a matter of personal preference.
This is a rare Instrument of great collectible value.
Thus a reserve has been placed on this sale.
*Buyers note that due to the value of this item Shipping Insurance will be added to the invoice at checkout.
Please see picture closeup pictures for condition details, and write us with any questions.

This was found in the attic of an old building that used to be a city lab from the early 1900\'s to the mid1970\'s

*International buyers welcome*

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