From: Patent Tactics, George Brock-Nannestad

Hello, I have looked at the Delkin claim that the product has "20 cents of
24k gold in every disc".

The present cost of gold is USD430/troy ounce (ca. 31 gram). Gold has the
density 19.3 g/cubic cm. A CD has a diameter of 120 mm. Using the precise
values and simple arithmetics (but reserving the right to have
miscalculated!), I have determined the thickness of the gold layer to be 66
nanometer, corresponding to 660 angstrom. Extrapolating information from a
book from 1955 a deposited film of that thickness in gold could well have a
reflectivity of 60% - however a lot has happened since then, and more precise
figures may be available. However, there the sources dry out - I have no idea
how this compares to other types of disc, except that tarnishing of gold is

However, I have also read the "White paper", and I find that it could
possibly be better written by a college student.

Kind regards,


> I wonder if Delkin licensed the old Kodak patents? Kodak used to claim a
> 300 year life-span, which is something that Mistui has never done.
> David Seubert
> Prentice, Will wrote:
> >Colleagues
> >
> >The press release at the bottom was posted to the AMIA list on 29 October.
> >
> >Has anyone tried these Delkin discs? I don't know if MAM-E or MAM-A have "20
> >cents of 24k gold in every disc", but otherwise there's nothing to suggest
> >these are significantly different as far as their constituent parts are
> >concerned. If anyone can find some more detailed data on these I'd be
> >grateful if I could see it.
> >
> >Assuming they prove to be reliable, it would be useful to have another
> >manufacturer of gold reflective layer CD-R's in the game. MAM-E no longer
> >manufacture DVD-R discs with a gold reflective layer, for instance. If Delkin
> >or someone else moved in to that market successfully, there's a vague
> >possibility that MAM-E might reconsider.
> >
> >Will
> >
> >.....................................
> >Will Prentice
> >Technical Services
> >British Library Sound Archive        Tel: +44 (0)20-7412-7443
> >(formerly National Sound Archive)    Fax: +44 (0)20-7412-7416
> >96 Euston Road             
> >London     NW1 2DB     UK   (online catalogue)
> >
> >
> >
> >
> >
> ><>
> >
> >
> >
> >
> >October 7, 2004
> >
> >
> >For Immediate Release
> >Contact: Alan Parry
> >Marketing Department
> >858-391-1234
> >[log in to unmask] <mailto:[log in to unmask]>
> >
> >
> >Delkin Devices, Inc., manufacturer of quality eFilm memory cards and
> >other innovative products, today introduced the eFilm Archival Gold
> >"300-Year" CD-R. eFilm Archival Gold CD-R's incorporate patented
> >Phthalocyanine (thalo-sy-a-neen) dye and a 24k gold reflective layer
> >into every CD-R. The innovative materials found in eFilm Archival Gold
> >CD-R's make them one of the most reliable storage medium available.
> >Typically CD-R's are known to deteriorate quickly due to Earth's common
> >elements: ultra violet light, heat, and humidity. Using an accelerated
> >aging process to test the longevity of CD-R media, eFilm Archival Gold
> >CD-R's have been shown to safely store your images for more than 300
> >years.
> >
> >"Consumers are now taking more pictures than ever with digital cameras,"
> >explains Martin Wood, CEO of Delkin Devices, Inc. "Our research has indicated
> >that the number one reason consumers take digital images is to preserve their
> >precious memories. eFilm Archival Gold CD-R's ensure that your precious
> >memories are safe for years to come."
> >
> >The patented Phthalocyanine dye is the most critical component of the
> >CD-R because it is where your data is stored. Your CD burner creates
> >pits in the dye layer when it burns a CD-R and your digital information
> >is stored in these pits. The Phthalocyanine dye reacts quicker to the
> >writing laser than dyes found in most CD-R's on the market, thus making
> >sharper pit edges and making your CD-R easier to read by CD drives.
> >Compared to Cyanine and Azo dyes found in the majority of CD-R's on the
> >market, Phthalocyanine dye lasts significantly longer when subjected to
> >the harmful effects of UV light, heat, and humidity.
> >
> >Gold is one of the most inert elements on earth and Delkin incorporates
> >20 of 24k gold into every eFilm Archival Gold disc. Gold's inert
> >characteristics prevent oxidation, a common cause of failure to most
> >CD-Rs. Along with the Phthalocyanine dye and gold reflective layer,
> >eFilm Archival Gold CD-R's provide the most extreme protection for your
> >digital images from environmental degradation.
> >
> >"People used to save their photos in family albums and store their
> >negatives in a safe place for reprints," says Wood. "In the digital age,
> >people store their photos on their computer. With the volatility of computer
> >hard drives and the constant threat of virus attacks, we wanted to provide
> >consumers with the most reliable storage medium available to back up their
> >images."
> >
> >Delkin will begin shipping eFilm Archival Gold CD-R's in early October
> >in a variety of quantities and types of packaging. The CD-R 10 Pack will be
> >sold in a protective plastic case that holds 10 CD-R's in polypropylene
> >sleeves. There will be a 1" 3 ring binder available with 16 eFilm Archival
> >Gold CD-R's in protective sleeves. The 25 pack will be available in a cake
> >box type spindle. Delkin also plans to ship 100 CD-R's in bulk packaging.
> >eFilm Archival Gold CD-R's will be available at consumer photography and
> >electronic stores worldwide and online at Delkin's website at
> >
> >"Our eFilm Archival Gold CD-R's will be a perfect companion to our
> >BurnAway as well," explains Alan Parry, Director of Marketing at Delkin
> >Devices, Inc. "The combination will provide consumers with a reliable
> >storage device and medium without the use of a computer." Delkin has
> >released a white paper further discussing the details of CD-R media. You can
> >download the white paper at
> ><> .
> >
> >Delkin Devices, Inc., based in San Diego, California, has been operating
> >since 1986. Since that time Delkin's eFilm digital storage products and
> >accessories have become an industry leader in both OEM and consumer markets.
> >Known as the "Camera Store" brand, eFilm is available worldwide primarily
> >through a network of independent camera stores, and a leading choice among
> >photographers passionate about digital photography.
> >
> >Delkin's success has been the result of providing a broad range of
> >products with premium quality, innovative designs and an ongoing
> >dedication to superior customer service. Delkin's website attracts
> >visitors from over 100 countries, underscoring the company's
> >international success.
> >
> >END
> >
> >Media Images are available for download at:
> ><>
> >
> >Delkin Devices will be appearing at PhotoPlus Expo in New York City
> >October 21-23 Booth:761
> >
> >
> >
> >
> >
> >
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