That shouldn’t be the case. Inkjet codes are sprayed directly by machines on the ceramic tile production line. It’s not like the factory sprays when they have time, or doesn’t spray when they don’t. What you buy should be high-end bricks. The midsole tiles are not coded. The authenticity of bricks depends on the quality of the bricks.

The national standard for ceramic wall and floor tiles stipulates the definition, technical requirements, test methods, inspection rules and signs, product instructions, packaging, transportation, storage and ordering of dry-pressed ceramic tiles. Porcelain tiles comply with gb/t4100-2006 appendix g (water absorption e≤0.5%); ceramic tiles comply with gb/t4100-2006 appendix l (water absorption e>10%).