A compound of Mercury Mercuric Nitric Dioxide liquid(brown in colour) .Manufactured under patented right from NOVAK INTERNATIONAL LABORATORIES Malaysia. Highly poisonous Mercury Mercuric Nitric Dioxide liquid knowns as Mercury dioxide-brown liquid is insoluble in water and is used in removing the anti-breeze on the face of any currency note, giving the notes back its original colors.  I can turn the white negative black before the chemical change is effected to turn into its original form.  Its a packaging, this assuring of transport and storage as they are very sensitive and require special handling