Copper Chloride（現在はHibiscusに改名）はBirmingham Pen Companyのキーストーン フォーミュラ インクで、ターコイズ色が特徴です。クロマトグラフィーテストでは低い耐水性を示しており、様々な紙質での性能を想定したCrisp Formulaシリーズの一部です。
特性
レビュー・参考リンク
Birmingham Pen Co. Hydrangea Fountain Pen Ink Review
Review of Birmingham Pen Co.'s Hydrangea ink from the Crisp series, praising its characterful purple color, legibility, subtle shading, and smooth flow in various pens. Notes it as part of the Crisp formulation designed for good performance across papers.
Birmingham Pens Crisp Inks Part 3
Detailed review of five Birmingham Crisp inks including swabs, writing samples on multiple papers, properties like dry time, water resistance, feathering, and sheen. Highlights their gorgeous colors and good behavior on fountain pen-friendly papers despite feathering on cheap copy paper.
Birmingham Inks - Mountain of Ink
Collection of swabs for all reviewed Birmingham inks, linking to individual ink reviews with visual comparisons of colors from the lineup.
INK REVIEW: BIRMINGHAM PEN COMPANY'S NEW FORMULA ...
Forum review of Birmingham Pen Company's Victorian Plum in Crisp formula, describing low to moderate saturation, no sheen, nice flow, and appropriate wetness in tested pens.
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