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        "description": "\u003cp\u003eTechnical pen performance depends on matching ink behavior to your surface and experience level. Koh-I-Noor produces three distinct formulations, each engineered for specific conditions.\u003c\/p\u003e\n\u003cp\u003eUniversal Drawing inks handle the broadest range of applications, technical pens, refillable plotting points, brush work on paper and film. Black and white deliver opaque coverage; all other colors remain transparent. Waterproof formula resists smudging once dry, essential for layered technical drawings where you'll overlay additional linework or annotation.\u003c\/p\u003e\n\u003cp\u003eRapidraw targets film work specifically. Fast-drying waterproof formula sets quickly to prevent smearing on non-absorbent surfaces, while remaining erasable on film for corrections. Short open pen time means you'll need to work steadily and clean nibs promptly, this ink suits experienced users who maintain consistent workflow and proper pen maintenance habits.\u003c\/p\u003e\n\u003cp\u003eUltradraw takes the opposite approach for paper applications. Slow-drying formula extends open pen time significantly, reducing clogs during pauses and making it forgiving for users still developing their technical pen technique. The longer working window accommodates interruptions without requiring immediate cleaning.\u003c\/p\u003e\n\u003cp\u003eAll three formulations come in 3\/4-ounce bottles with easy-fill spouts that simplify reservoir loading without mess. Choose based on your primary surface and how you work rather than defaulting to whatever's available.\u003c\/p\u003e",
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