{"product_id":"grumbacher-oil-paint-indanthrone-blue-37ml-pre-tested-high-tinting-strength-lightfast","title":"Grumbacher Oil Paint Indanthrone Blue 37ml — Pre-Tested, High Tinting Strength \u0026 Lightfast","description":"\u003cp\u003e\u003cstrong\u003eGrumbacher Pre-Tested Oil Paint in Indanthrone Blue is a professional, high-tinting, highly lightfast oil colour in a 37ml tube, formulated for reliable masstone and consistent mixing.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIndanthrone Blue (P109G) from Grumbacher’s Pre-Tested line is a deep, warm anthraquinone blue supplied in a 1.25-ounce tube and made in the USA. Every tube is evaluated for masstone, mixability, pigment dispersion, viscosity and drying characteristics, so artists get a consistent, single-pigment colour with powerful tinting strength and excellent permanence. This oil paint is designed for studio use by painters who need dependable performance across mixes, glazes and opaque passages.\u003c\/p\u003e\n\n\u003ch3\u003eHow does Indanthrone Blue behave in mixtures and glazes?\u003c\/h3\u003e\n\u003cp\u003eIndanthrone Blue is opaque with very high tinting strength, so small amounts significantly shift mixtures. It maintains its depth in both full-strength passages and diluted glazes, giving rich, stable blues without muddying neutrals when used judiciously.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStrong tinting strength — add sparingly to mixtures for controlled shifts.\u003c\/li\u003e\n  \u003cli\u003eOpaque body that still performs well in thin glazes when medium is adjusted.\u003c\/li\u003e\n  \u003cli\u003eResists desaturation in tints — stays vibrant when lightened with white.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat technical qualities make this paint reliable for professional work?\u003c\/h3\u003e\n\u003cp\u003eGrumbacher Pre-Tested colours undergo hands-on drawdowns and lab-style checks for lightfastness, drying rate, and pigment dispersion to ensure predictability. Most colours in the line are single-pigment formulations with an excellent (I) lightfastness rating, which supports archival results when used in standard oil painting systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-tested masstone and drawdown comparisons ensure consistent colour batches.\u003c\/li\u003e\n  \u003cli\u003eEvaluated for drying behavior so layers interact predictably.\u003c\/li\u003e\n  \u003cli\u003eSingle-pigment formulation reduces unexpected colour shifts in mixes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow should I use this 37ml tube in studio practice?\u003c\/h3\u003e\n\u003cp\u003eUse the 37ml tube for mid-to-long-term projects, plein air sessions, or to trial a new pigment on your palette. Because Indanthrone Blue is potent, squeeze out modest amounts and extend with medium as needed; store the tube tightly capped to preserve viscosity and workability.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStart with small dollops — the pigment covers a large area.\u003c\/li\u003e\n  \u003cli\u003eAdjust viscosity with linseed or alkyd mediums for glazes or impasto.\u003c\/li\u003e\n  \u003cli\u003eLabel dried mixes and test lightfastness when combining with unfamiliar pigments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Artists who demand consistent, professional-grade oil colour — including students advancing to professional practice, painting instructors, conservation professionals, and studio artists — will appreciate Indanthrone Blue’s stability, strong tinting power, and predictable behavior in mixes. If you want a deep, warm blue that stands up in both masstone and tints and is backed by centuries of Grumbacher formulation and testing experience, this 37ml tube is a compact, dependable choice for any serious palette.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is Indanthrone Blue lightfast?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Grumbacher’s Indanthrone Blue in the Pre-Tested line carries an excellent (I) lightfastness rating for archival use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this paint for glazing?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It works in glazes when thinned with a suitable oil medium; use sparingly because of its high tinting strength.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Grumbacher","offers":[{"title":"Default Title","offer_id":55293700997457,"sku":"B000YQKCKS","price":35.11,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1086\/5567\/3681\/files\/grumbacher-indanthrone-blue-front-tube.jpg?v=1791925641","url":"https:\/\/craftiche.co.uk\/products\/grumbacher-oil-paint-indanthrone-blue-37ml-pre-tested-high-tinting-strength-lightfast","provider":"Craftiche","version":"1.0","type":"link"}