Dear Mrs. Seymour,
I didn't find anything related to 'tricolor diplomatic tableware tape' in the conservation and art handling field.
I found some information about a topology of sealing tape that presents the colours or the flag of one nation. From some reviews are very positive about the resistance and adhesive's abilities, but are not related to a professional or scientific testing system.
I hope that these informations will be helpful.
Best regards
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Arianna Buffagni
Conservator
Freelance/Private Practice/Self-employed/Independent
Quattro Castella
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