Noodler's Fountain Pen Ink 3oz Polar Black
Noodler's Polar Black delivers an excellent performance with their archival quality, freeze/forge/water resistant nature. The waterproof/fraud proof line cannot be altered on a check or envelope by rain or bleach/ammonia. They consist of over 97% water content and rinse (or simply rub) off lucite/celluloid/acrylic rod stock testing and ebonite testing stock. If dried in the bottle it can be reconstituted with tap water but once on cellulose paper they stay on despite rain/soaking and the soaps of a check forger.
Polar Black will resist forming a solid mass of ice within a glass ink bottle during most cold weather conditions (though they will form some harmless ice "slush" when very cold). Polar inks have fast dry time, better flow rate, and are basic "freeze resisting" inks to avoid expansion barrel cracks in pens and broken bottles in mail boxes on cold days.
All Noodler's inks are 100% made in the USA from cap to glass to ink. The ink with the catfish on the label symbolizes a southern sport that attempts to equalize the struggle between man and animal in the quest for a sense of fair play - and thus a fair price.
Note: There is no guarantee "never to freeze regardless of the temperature" but, they are made to resist the damaging expansion that water based products can be subject to when exposed to freezing temperatures and harsh winter weather.
Caution: If mixed with conventional ink the fraud proof ink WILLrevert to conventional ink and all those properties will be lost.