Malcolm discusses a film seen on early vinyl discs like Victrolac from
the early 30s. David Burnham mentions a Mercury 78 which also has a
surface film. But the original posting seemed to indicate that we would
find this on all pressings: "The common contaminant to all pressed disc
the most difficult to safely remove is the mold release wax." It was
not just a difference between mould and mold. It was the word "all".
Mike Biel [log in to unmask]
-------- Original Message --------
Subject: Re: [ARSCLIST] victor record conservation
From: H D Goldman <[log in to unmask]>
Date: Tue, June 12, 2012 11:36 pm
To: [log in to unmask]
You're correct. I was referring to "mould-release wax". Hey, I never
claimed I could type or smell, er, spell. Which maybe why it took me so
long to prepare an acceptable copy of my dissertation. That 'ol bag at
the library light boxed every page for margins & footnotes; no
corrections allowed. One misplaced dot from a Rapidiograph tip & you
start all over.
On Jun 12, 2012, at 9:31 PM, Malcolm Rockwell wrote:
> No, not wax released by mold, but a waxy substance that appears on the entire surface of many early vinyl (?) pressings. Mold grows on finger oils, and other organic substances, deposited by the unwary (or ungloved) and can destroy the info in the groove. The goop I'm talking about is something else and I think Duane means "mould release wax" not "mold". Dr. Biel sez he's not heard of any such substance so, in my opinion, the jury is still out on what it actually is.
> On 6/12/2012 8:26 AM, Tom Fine wrote:
>> Hi Malcolm:
>> I think we took different meanings from Duane's posting. I took his term "mold release wax" to mean it's some sort of wax used in the record molding (manufacturing, pressing) process. Are you taking it to mean a wax that is released by mold growing on the record surface?
>> I wish Duane would chime back in and clarify this.
>> -- Tom Fine
>> ----- Original Message ----- From: "Malcolm Rockwell" <[log in to unmask]>
>> To: <[log in to unmask]>
>> Sent: Tuesday, June 12, 2012 12:55 PM
>> Subject: Re: [ARSCLIST] victor record conservation
>>> I believe he is talking about that waxy substance that seems to exude from early plastic pressings (I say plastic because I do not know the composition of the physical matrix nor any changes in formulation that occurred over time) in the 1950s. It's the same goop (now there's a highly technical term) that I believe is responsible for the transfer of some inks from printed record sleeves to the surface of the record itself (which I have found to be non-removable).
>>> It is possible that the goop is heat and/or pressure specific, or possibly time related if it is found to be caused by the packaging process and the amount of cool-down the record went through between pressing, sleeving and boxing. The substance may actually be pressing facility specific, as well.
>>> I've cleaned many 78s of this substance and "waxy" is the best description I've heard to date. Cleaning with a couple of drops of Dawn dish detergent in a quart of distilled water and then thorough rinsing and drying does the trick for me. I have not done controlled experiments to see if the process of leaching reoccurs after one cleaning or not. I suspect it does not; that once the substance is removed from the record it has been exhausted from the substrate already and no longer a problem. But, as I say, this aspect still requires investigation.
>>> Malcolm Rockwell
>>> On 6/11/2012 9:00 PM, Michael Biel wrote:
>>>> From: H D Goldman<[log in to unmask]>
>>>>> The common contaminant to all pressed disc recordings&
>>>>> the most difficult to safely remove is the mold release wax.
>>>> What is mold release wax? Is it something that is part of the mix of
>>>> the material of the record? You include it in discussing all materials
>>>> "[lacquer, acetate, Diamond Disc& vinyl]" which include discs which are
>>>> not pressed. I have visited pressing plants using vinyl and styrene,
>>>> and have seen films of many different eras of shellac and early vinyl
>>>> pressing, and never once have I seen any hint of an application of any
>>>> surface material in the record press other than inserting or injecting
>>>> the record compound. The stampers are never coated with anything
>>>> between pressings. The records all come off the press without any
>>>> problem whatsoever, and often they are immediately sleeved.
>>>>> It is also the most difficult material to safely& thoroughly
>>>>> remove from the surface of a new phonograph record.
>>>> So, what is mold release wax? Since there is no evidence that the
>>>> stampers are coated, if it is part of the chemical makeup of the record,
>>>> how could this be a removable surface coating?
>>>> Mike Biel [log in to unmask]
>>>>> This wax is poorly soluble in the pure, water-soluble, simple alcohols [methanol, ethanol, isopropanol& n-propanol]; less so when diluted with water. Bugs love this wax& while it is difficult for thoroughly cleaned disc surfaces [lacquer, acetate, Diamond Disc& vinyl] to support mold growth, once infestation is established by feeding on the mold release wax, all of these disc surfaces can be permanently damaged. For used discs a variety of contaminants including fingerprints& the micro dust from old sleeves increase the chance for mold growth.
H D Goldman Lagniappe Chemicals Ltd.
PO Box 37066 St. Louis, MO 63141 USA
v/f 314 205 1388 [log in to unmask]