{"product_id":"jakar-ruling-pen-140mm","title":"Jakar Ruling Pen — 140mm","description":"\u003cp\u003eThe Jakar Ruling Pen is a precision drawing instrument with a long history in technical drawing, illustration, and calligraphy. Two adjustable metal blades hold ink between them by capillary action, and the gap between them — and therefore the line width — is controlled by a simple screw adjustment. Dip the tip into ink, adjust the screw to your desired width, and draw against a ruler or straight edge for clean, consistent lines of any width from hairline to several millimetres.\u003c\/p\u003e\n\n\u003cp\u003eBeyond technical drawing, ruling pens are popular with artists for applying masking fluid in precise lines before watercolour washes, for ink line work, and for calligraphic mark-making that produces variable line widths through changes in angle and pressure. A tool with genuine versatility in the right hands.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e140mm ruling pen\u003c\/li\u003e\n\u003cli\u003eScrew-adjustable double blade tip — variable line width\u003c\/li\u003e\n\u003cli\u003eInk held between blades by capillary action\u003c\/li\u003e\n\u003cli\u003eBlack plastic handle\u003c\/li\u003e\n\u003cli\u003eSupplied in a transparent plastic hanging wallet\u003c\/li\u003e\n\u003cli\u003eSuitable for ink, masking fluid, and liquid media\u003c\/li\u003e\n\u003cli\u003eBrand: Jakar\u003c\/li\u003e\n\u003cli\u003eSKU: 1191\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eHow does a ruling pen work?\u003c\/h3\u003e\n\u003cp\u003eThe two metal blades at the tip of the pen hold ink between them by capillary action — surface tension keeps a reservoir of liquid between the blades. The screw controls how far apart the blades are held, which determines how wide a line the pen draws. Dip the tip into ink (do not overfill), adjust the screw, hold the pen upright, and draw against a ruler or straight edge for a consistent line.\u003c\/p\u003e\n\n\u003ch3\u003eWhat can I use a ruling pen for?\u003c\/h3\u003e\n\u003cp\u003eRuling pens are used for technical drawing and drafting, precise ink line work in illustration, applying masking fluid in straight lines before watercolour washes, and calligraphic mark-making. They require some practice to use well but produce results that other pens cannot match for precision and variable width.\u003c\/p\u003e\n\n\u003ch3\u003eWhat inks and media work with a ruling pen?\u003c\/h3\u003e\n\u003cp\u003eDrawing inks, Indian ink, and masking fluid all work well. The pen should be cleaned thoroughly after use — dried ink between the blades is difficult to remove and will affect performance. Rinse with water (for water-based media) or the appropriate solvent immediately after use.\u003c\/p\u003e\n\n\u003ch3\u003eIs this a general writing tool?\u003c\/h3\u003e\n\u003cp\u003eNo — a ruling pen needs to be held quite upright and dipped frequently, and works best against a ruler or straight edge. It is a specialist drawing tool rather than a writing instrument.\u003c\/p\u003e","brand":"Jakar","offers":[{"title":"Default Title","offer_id":57451994415479,"sku":"1191","price":5.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0076\/2288\/5428\/files\/ruling1191.jpg?v=1789198404","url":"https:\/\/craftandcanvas.co.uk\/products\/jakar-ruling-pen-140mm","provider":"Craft and Canvas","version":"1.0","type":"link"}