Bulletproof (UV resistant, bleach resistant, etc.) = Yes Eternal (Archival, fade-resistant) = Yes Forgery-Resistant (Impervious to lasers, alcohols, solvents, ideal for security documents) = Yes Water-Resistant (waterproof) = Yes Fluorescent (Glows under UV light) = No Lubricated (Lubricated inks for piston mechanism) = Yes Freeze-Resistant (Resists freezing at extreme low temperatures) = Yes After receiving feedback from customers, Polar Brown has been made a more conventional color - though still a completely bulletproof, freeze resisting, lubricated ink - it is now a striking dark brown ink. It remains extremely durable, but now has the more conservative color most of our customers requested that it become. The older version bi-gravity Polar Brown with the 'orange halo flames' is being phased out (both due to customer feedback as well as a pending material shortage). Apologies in advance for any inconvenience this might cause - but we feel strongly the new color will more closely serve the desires and wants of our customers and will be a longer term offering in terms of more consistent availability and color.