Core Tips: Letter from NHC on Seeking public comments for “Food Safety National Standards Determination of 1,4 - Butanediol Migration of Food Contact Materials and Products”, “Food Safety National Standards Food Contact Materials and Products Determination of Migration of Acrylic Acid and Methacrylic Acid”, “Food Safety National Standard Determination of 4-Hexyl Resorcinol Residues in Foods”, “Food Safety National Standards Cinnamaldehyde in Foods Determination of residual amount”, etc. 11 Food safety National Standards has been released.