The road to success was not an easy one, prototypes failed, the teams ideas led to many dead ends & tested more than a thousand materials whilst trying to perfect the ideal gel ink.
The method for manufacturing gel pens uses a process called centrifuging which put simply is rotating at speed which has to be carried out with precision to achieve the required performance.
Gel ink contains pigment suspended in a water based gel. This type of ink achieves strong vibrant colours available in a wide range of colours including metallic & fluorescent shades.
Thanks to innovation, skilled engineers & technology some 3 decades ago Sakura Gelly Roll Pens remain the choice of many, here are 3 popular examples
Sakura Gelly Roll Basics
The waterproof ink is fade resistant & of archival quality & are ideal for arts & crafts. These smooth writing pens are available in a choice of two colours
Black with a fine 0.7mm tip writes a 0.3mm line
White wih a medium 0.8mm nib writes a 0.4mm line
Sakura Gelly Roll Stardust Pen
The unique formulation of the ink in these pens creates a sparkle effect.
It is non toxic to ACMI standards, fade & water resistant & won't bleed through most paper. With the exception of the black ink Stardust Pens are archival quality. They have a 1.0mm tip, write a 0.5mm line & are available in 25 glittery colours that twinkle like stars on light or dark surfaces.
Sakura Gelly Roll Metallic
An excellent smooth writing rollerball with a 1.0mm tip that is comfortable to use & ideal for light, dark, glossy & matt surfaces. They are available in 14 gleaming colours including copper & sepia, the opaque metallic ink is waterproof, fade resistant & doesn't smear or bleed through most paper.
The Gelly Roll Website is abound with how to videos creating things from cards to notebooks you can find them here