I think 3M and Audio Devices (AudioTape) were making acetate tape into the 60's. I've dubbed many 
quarter-track duped tapes that are "see through", which I think always means acetate backing. Known 
production dates up to the 1963-64 timeframe. I do think Ampex in Illinois started using 1-mil 
polyester tape earlier than most duplicators. Columbia duped tapes that I've seen from the early 
60's have a reddish color and are see-through so I think they might be 3M 190. RCA used its own 
brand of tape (not sure if it was contract-manufactured by 3M or someone else), which was also 
see-through up to the mid-60's.

My point is, acetate tape was made into the time period that 1" tape would have been manufactured 
because there were 1" 8-track recorders out in the field.

-- Tom Fine

----- Original Message ----- 
From: "Dennis Rooney" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, April 18, 2012 1:34 PM
Subject: Re: [ARSCLIST] Acetate 1" tape ? ? ?

> 3M 190 (red oxide) was acetate. 3M's Type 201-203 (later renamed Dynarange)
> was introduced in 1962-3. I have boxes of it labelled "Developmental
> Product 1273" The NYPO/Berstein Mahler Third was mastered on 1/2" 190 and
> those tapes were so warped when I worked on them that a chamois was used to
> flatten the tape long enough for it to pass across the pb head.
> On Wed, Apr 18, 2012 at 12:49 PM, Richard L. Hess
> <[log in to unmask]>wrote:
>> Hi, All,
>> For some reason, I found a bit of cognitive dissonance when I worked on a
>> reel of 1" wide tape that appeared to be acetate.
>> This dissonance probably stems from the fact that in 1956, PET-film-based
>> ("Mylar(tm)") tape was produced for video recording and almost all
>> wide-width tape I've seen has been PET-based. I suspect this is something
>> like 3M 201 "Dynarange". Was this common? I would have suspected 202 would
>> have been the more likely choice.
>> These three tapes have been abused and are in horrid shape, warped, severe
>> edge damage, and aren't behaving at all!
>> I'm just checking -- I can do more tests to confirm, but I'm wondering
>> what others' experiences are. I'm pretty certain I've seen 1/2-inch
>> acetate...
>> Cheers,
>> Richard
>> --
>> Richard L. Hess                   email: [log in to unmask]
>> Aurora, Ontario, Canada           (905) 713 6733     1-877-TAPE-FIX
>> Quality tape transfers -- even from hard-to-play tapes.
> -- 
> Dennis D. Rooney
> 303 W. 66th Street, 9HE
> New York, NY 10023
> 212.874.9626