Hi.  I'm a Spanish student finishing my curator degree at the
College of Preservation Restoration of Cultural Property in Madrid
( http://www.escrbc.com/en ).

For my Final Degree Work I am working with piano roll treatments.
I've been searching information about what is the red or blue material
[ink? dye?] used to mark the Metrostyle rolls.  If you know something
about it I would be so grateful.  Thanks.

Marina Caparrós Pinar
Madrid

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