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method for manufacturing a tamper-proof medium for thermal printing, a tamper-proof medium for thermal printing, and, using a tamper-proof medium for thermal printing
method for manufacturing a tamper-proof medium for thermal printing, a tamper-proof medium for thermal printing, and, using a tamper-proof medium for thermal printing
the present invention relates to the method of manufacturing a tamper-proof medium for thermal printing, wherein a liquid treatment composition comprising at least one acid is deposited on a substrate comprising a thermochromic coating layer comprising at least a leuco halochromic dye.
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