Montblanc Ink Amethyst Purple

What it is

Montblanc’s bottled fountain pen ink in Amethyst Purple, 60 ml, catalogued as MB128187. A dye-based ink in the house’s shoe-shaped glass bottle — the one with a sloped well at the front, so a pen can still be filled when the bottle is two-thirds empty without tipping it. The cap carries the enamel emblem and the three-ring detail. The color is a saturated true purple: brighter than a plum, deeper than a violet.

Why it’s on this list

Black is for documents. Blue is for everyone. Purple is for margins, corrections, and the notes you want to find again in a week. A second ink color is the cheapest possible upgrade to a reading and writing habit, and it should be a color you can read at a glance across a page of black type.

The bottle is the other argument. That angled reservoir is the reason to pay Montblanc’s price rather than the ink’s: a large piston pen needs real depth to fill, and this bottle keeps giving it long after a flat-bottomed bottle has stopped. It is a small piece of thinking that most ink makers never bothered to do.

What to know before you buy

• It is not waterproof. This is a dye ink. A wet page runs. Do not use it for anything that has to survive weather or an archive — that calls for an iron-gall or pigmented ink, and those are harder on pens.
• You are paying for the bottle and the emblem. Per milliliter, Montblanc is near the top of the market. Diamine and Waterman sell purples that write just as well for a fraction of the price. If what you want is ink, buy those. If you want the object on the desk, buy this.
• Sixty milliliters is a great deal of ink. At normal use it will outlast years. Keep it capped, keep it out of sun, and never pour ink from a pen back into the bottle.
• You need a way to draw it. Bottled ink means a piston filler, a converter, or a syringe. Cartridge-only pens cannot use it as sold.
• Nib and paper change the color. A wet, broad nib shows the depth. An extra-fine on cheap copy paper will look thin and can feather.