Identifying Tape Types

["Nathan Georgitis" <nathan_georgitis@xxxxxxxxxxx>]

Hello,

I am in the process of creating an inventory of a large collection of open 
reel recordings on 1/4-inch, polyester-base magnetic tape. These reels date 
from 1970 to 1990. Few of the reels are housed in their original boxes. None 
of the tapes seem to have identifying tags at the head or tail.

I would like to identify the brands and numbers of these tapes, if possible. 
I have been noting the presence or absence of backcoating and trying to 
develop a feel for tape thickness and an eye for the colors of oxide 
formulations. Does anyone have any tips for identifying tapes beyond these 
steps? Is there any collected information out there on tape types and their 
characteristics, such as thickness, reference fluxivity, years of 
production, etc.

Thanks in advance for any help.

Nathan Georgitis
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