{"product_id":"robert-oster-school-blue-50ml-ink-bottle","title":"Robert Oster School Blue 50ml Ink Bottle","description":"\u003cp\u003eRobert Oster School Blue 50ml Ink Bottle delivers a clean, reliable everyday blue with the easy legibility writers want for notes, journals, and correspondence. The tone lands in a balanced medium range, bright enough to stand out on the page while remaining refined for professional use.\u003c\/p\u003e\u003ch2\u003eColor \u0026amp; Performance\u003c\/h2\u003e\u003cp\u003eThis dye-based, water-soluble fountain pen ink offers gentle shading on fountain-pen-friendly papers, adding character without sacrificing clarity. Flow is smooth and well-behaved across a wide range of nibs, with dry times that vary by paper and nib width. As a water-soluble formula, it is not waterproof, making cleanup and pen maintenance straightforward.\u003c\/p\u003e\u003ch2\u003eBottle \u0026amp; Practical Details\u003c\/h2\u003e\u003cp\u003eThe 50ml bottle is compact and travel-friendly, with a secure screw cap for everyday use at the desk or on the go. The recyclable PET construction reflects Robert Oster's practical, environmentally mindful approach. School Blue loads cleanly in converters and piston fillers and pairs well with daily writing, study sessions, and casual sketching.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eBrand: Robert Oster\u003c\/li\u003e\n\u003cli\u003eColor: School Blue (medium blue)\u003c\/li\u003e\n\u003cli\u003eInk type: Dye-based, water-soluble fountain pen ink\u003c\/li\u003e\n\u003cli\u003eVolume: 50ml\u003c\/li\u003e\n\u003cli\u003eBottle material: Recyclable PET\u003c\/li\u003e\n\u003cli\u003eWater resistance: Low\u003c\/li\u003e\n\u003cli\u003eOrigin: Australia\u003c\/li\u003e\n\u003cli\u003eRecommended use: General writing on fountain-pen-friendly paper\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Robert Oster","offers":[{"title":"50ml Bottle","offer_id":32946469765154,"sku":"50843","price":18.0,"currency_code":"USD","in_stock":true},{"title":"2ml Sample","offer_id":32946469797922,"sku":"50844","price":1.75,"currency_code":"USD","in_stock":true},{"title":"5ml Sample","offer_id":32946469830690,"sku":"50845","price":3.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2083\/6627\/products\/s-l1600_37_64ca6a2b-da98-4701-b187-48554326a380.jpg?v=1552582009","url":"https:\/\/www.truphaeinc.mom\/products\/robert-oster-school-blue-50ml-ink-bottle","provider":"Truphae","version":"1.0","type":"link"}