tender for supply of ink for hologram label production on a running contract , supply of penetrating security ink for numbering in letter press printing machine (as per tender specification) , supply of uv changing colour - security ink (black to red) for letter presses printing machine ( as per tender specification) , supply of uv changing colour - security ink (black to green) for letter presses printing machine (as per tender specification) , supply of uv changing colour - security ink (grey to red) for letter presses printing machine (as per tender specification) , supply of uv changing colour - security ink (grey to green) for letter presses printing machine (as per tender specification) , supply of offset based security invisible ink (as per tender specification)