Legend - Principia Color:Principia "Joule" is characterized by its

"Joule" is characterized by its large body and nib

shimmering glow

【TVアニメ『笑顔のたえない職場です。』公式X】

カシオの電卓においては唯一となる山形カシオでの国内生産です。

If you don't keep this promise

Legend - Principia Color:Principia "Joule" is characterized by itsA new philosophy themed ink series designed to showcase sheen a phenomenon where areas of heavier writing or pooled ink reveal a glossy color different from the inks base color. Sheen color is difficult to control, and it is usually determined by the base color of the ink. However, through new technology, this series achieves color combinations and balance that were previously difficult to create. This ink features a purple base with yellow green