1 oz bottle of eternal ink. Eternal refers to any Noodler's Ink that resists the effects of time - moisture humidity UV light acids water exposure and many common detergents such as dish soaps and household ammonia as well as alcohols and acetone (which conventional ball point pens have no resistance to). Many Noodler's inks such as eternal and bulletproof inks are made with the ideal of reaching out as far into immortality as the written word permits us to reach - the only way to speak to future generations remains the written word durably made upon the page.