54th Mass Bottled Ink [Bulletproof Legal Blue/Black] by Noodler’s Ink®..3 oz

Noodler’s Ink Properties….as per Noodler’s Ink website:

“Bulletproof Ink” is a term that may be a perpetually changing measure. As Noodler’s developed greater durability in its inks, the definition of “bulletproof” evolved to accommodate new durability. When first described in Greg Clark’s “Ink Sampler” magazine many years ago it generally referenced water resistance and some other archival qualities. Later the term evolved to include resistance to an increasing array of industrial solvents and bleaching agents and other tools of the forgers – and severe tests in the Arizona sunlight over many months (as well as heat lamps, ageing ovens, biological attacks in moist conditions – Hurricane Katrina situations for example – among many further tests…).