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A Blue International Seed Sample Certificate is issued when sampling from the lot is not under the responsibility of an ISTA-accredited laboratory. Therefore the results obtained by the ISTA-accredited laboratory apply only to the sample and not to the seed lot the sample was taken from. GOOD TO KNOW About 200 000 ISTA Orange International Seed Lot Certificates and Blue International Seed Sample Certificates are issued every year facilitating seed trading internationally.