This is an "bulletproff ink"....according to the manufacturer is impervious to water, bleach and sunlight.
It is best to write and to read under a "black light"... invisible!
100% made in the U.S.A...from the cap to the bottle to the ink.
As a certified retailer for Noodler's Ink® I am able to only list their products at their recommended MSRP or allowed discount. Other certified retailers of this manufacturer are given the exact same guidelines. Should you see prices under the MSRP, I would caution you as to whether or not you are receiving an item from a certified retailer of this manufacturer. Purchasing items from non-certified retailers may invalidated your guarantee. However, only the manufacturer can address that issue with certainly. Remember buying below MSRP may not actually represent a "savings".