N.Y.C. Admin. Code § 20-612: § 20-612 Requirements for purchase or sale.

1. Every dealer of etching acid shall request valid photo identification from each purchaser of etching acid at the time of such purchase and contemporaneously record in writing or electronically such purchaser's personal information.

2. No person shall purchase etching acid without first providing his or her personal information to the dealer of etching acid pursuant to this subchapter. It shall be an affirmative defense to a violation of this subdivision that the dealer failed to request personal information from the purchaser of etching acid.

3. It shall be unlawful for any person to dispense etching acid to any person without recording such purchaser's personal information.