The colour of 'Tag' stitched on bag of certified seeds is

Concept

India's seed-quality framework (governed under the Seeds Act, 1966, and detailed in the Minimum Seed Certification Standards) recognises four main seed-tag categories, each carrying its own standardised tag colour. Breeder, foundation, and certified seed are successive multiplication grades in the certification chain; truthfully labelled seed is a separate, non-certified category that a producer may self-declare as an alternative to formal certification. Foundation and certified seed are certified by the official seed-certification agency, while breeder seed is produced and tagged directly by the breeder or institute. Despite this difference in certification status, each of the four categories carries its own standard tag colour, letting a buyer identify a seed lot's category at a glance.

Application

The question asks specifically about the tag colour used for certified seed. The standard colour code across the four categories is:

Certified seed -- produced from foundation seed (or, under the standards, from certified seed itself) and sold for general cultivation -- therefore carries the Blue tag.

Cross-check

Foundation seed -- produced from breeder seed (or, under the standards, from foundation seed itself) and subject to a stricter purity standard -- carries a White tag rather than Blue, confirming the two categories are not interchangeable. Plain red and plain yellow (distinct from the golden-yellow breeder tag) do not appear in the standard colour code at all.