Diamine are one of our favourite ink brands. They've been around since 1864 and they've been producing quality inks ever since. Their ink is safe to use in all brands of fountain pen. It's water-based, acid-free and non-toxic, and is also vegan-friendly.

Their expertise is behind this series of Cult Pens exclusive colours inspired by the wonders of the world.

Colosseum: Travertine limestone is one of the three main building materials used to construct the colosseum along with tuff and brick-faced concrete. The travertine limestone was used to construct the pillars, ground floor and external wall, as well as much of the seating in the interior. It's a beautiful sandy brown colour and we loved it, so we made an ink that looks like it!

Taj Mahal : Two notable decorative features are repeated throughout the Taj Mahal: Pietra dura and Arabic calligraphy. Arabic calligraphy is prevalent on the arched entrances to the mausoleum proper. Pietra dura incorporates the inlay of semiprecious stones, including lapis lazuli which we've taken inspiration from with this colour.

Petra : Once a major regional trading hub due to its proximity to the incense trade route, the ancient sandstone-carved city of Petra is found in Southern Jordan, adjacent to the mountain of Jabal Al-Madbah. The beautiful pink hue of the sandstone rock inspired the colour of this ink.

Chichen Itza was a pre-Columbian city constructed by the Mayans in modern day Mexico. Once a major focal point in the Northern Maya Lowlands, Chichen Itza is one of the largest cities built by the Mayans and is believed to have been one of the mythical great cities (Tollans) referred to in later Mesoamerican literature. Chichen Itza is a beautiful blue-grey inspired by the Grey Limestone blocks used to construct the ancient pyramids, temples, columned arcades and other stone structures found at Chichen Itza.

Machu Picchu is an Inca citadel located in the Eastern Cordillera of southern Peru. It's one of the most recognisable names associated with Inca history and remained undiscovered by the western world right up until 1902 when it was discovered by Agustín Lizárraga but didn't become popularised until Hiram Bingham came across the site in 1911. The green colour of the Machu Picchu ink is inspired by the Huayna Picchu Mountain Range, which is home to Machu Picchu.

Available in 30ml and 80ml bottles.

Swatches provided by the fabulous Claire, who really brought the inks to life. Have a look at her instagram for more amazing ink art @claire.scribbleswithpens.