{"product_id":"blackline-8-oz-black-permanent-marking-chalk-select-size","title":"Blackline - Black Permanent Marking Chalk - (Select Size)","description":"\u003cstyle\u003e\n.pb-wrap{--pb-line:#e1e3e5;--pb-head:#f6f6f7;max-width:100%}\n.pb-wrap .pb-intro{margin-bottom:20px}\n.pb-acc{border:1px solid var(--pb-line);border-radius:8px;margin:0 0 8px;overflow:hidden}\n.pb-acc\u003esummary{cursor:pointer;padding:14px 16px;font-weight:600;line-height:1.35;\n list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}\n.pb-acc\u003esummary::-webkit-details-marker{display:none}\n.pb-acc\u003esummary::marker{content:\"\"}\n.pb-acc\u003esummary::after{content:\"+\";font-size:22px;font-weight:400;line-height:1;flex:0 0 auto}\n.pb-acc[open]\u003esummary::after{content:\"\\2212\"}\n.pb-acc[open]\u003esummary{border-bottom:1px solid var(--pb-line);background:var(--pb-head)}\n.pb-acc\u003esummary:hover{background:var(--pb-head)}\n.pb-acc .pb-body{padding:16px}\n.pb-acc .pb-body\u003e:first-child{margin-top:0}\n.pb-acc .pb-body\u003e:last-child{margin-bottom:0}\n.pb-q{border:0;border-bottom:1px solid var(--pb-line);border-radius:0;margin:0}\n.pb-q:last-child{border-bottom:0}\n.pb-q\u003esummary{padding:12px 0;font-weight:600}\n.pb-q[open]\u003esummary{background:transparent;border-bottom:0}\n.pb-q\u003esummary:hover{background:transparent;text-decoration:underline}\n.pb-q .pb-body{padding:0 0 12px}\n.pb-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}\n.pb-table{width:100%;border-collapse:collapse;font-size:14px;min-width:380px}\n.pb-table th,.pb-table td{border:1px solid var(--pb-line);padding:8px 10px;\n text-align:left;vertical-align:top}\n.pb-table thead th{background:var(--pb-head)}\n.pb-table caption{caption-side:top;text-align:left;font-weight:600;padding:0 0 8px}\n.pb-note{font-size:13px;opacity:.75;margin-top:16px}\n.pb-wrap a{color:#3b82f6}\n.pb-wrap a:hover{color:#2563eb}\n\u003c\/style\u003e\u003cdiv class=\"pb-wrap\"\u003e\n\u003ch2\u003eBlackline - Black Permanent Marking Chalk - (Select Size)\u003c\/h2\u003e\n\u003cdiv class=\"pb-intro\"\u003e\n\u003cp\u003eBlackline's permanent black chalk is formulated to infuse into porous surfaces like wood and concrete, so a snapped line survives wind, water and job-site traffic instead of wiping away like standard chalk. It still washes off hands and clothing with mild soap and water.\u003c\/p\u003e\n\u003cp\u003eStocked in the 8 oz. refill bottle (B1816) for topping up a chalk line box, and the 5 lb. bag (BL54) for high-volume framing crews who go through chalk fast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdetails class=\"pb-acc\"\u003e\u003csummary\u003eFeatures and Common Uses\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\n\u003cul\u003e\n\u003cli\u003ePermanent formula infuses into wood and concrete for a line that resists wind, water and foot traffic\u003c\/li\u003e\n\u003cli\u003eLeaves a crisp line that resists smudging compared to standard chalk\u003c\/li\u003e\n\u003cli\u003eWashes off hands and clothing with mild soap and water despite the permanent line\u003c\/li\u003e\n\u003cli\u003eAvailable in an 8 oz. refill bottle or a 5 lb. bulk bag\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCommonly used for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSnapping permanent layout lines on framing and sheathing\u003c\/li\u003e\n\u003cli\u003eConcrete and masonry layout lines exposed to weather\u003c\/li\u003e\n\u003cli\u003eHigh-volume framing crews needing a bulk refill\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"pb-acc\"\u003e\u003csummary\u003eSpecifications\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\n\u003cdiv class=\"pb-scroll\"\u003e\u003ctable class=\"pb-table\"\u003e\n\u003ccaption\u003eProduct Specifications\u003c\/caption\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eBlackline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eColour\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eFormula\u003c\/th\u003e\n\u003ctd\u003ePermanent, waterproof, windproof\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e8 oz. Size (B1816)\u003c\/th\u003e\n\u003ctd\u003eRefill bottle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003e5 lb. Size (BL54)\u003c\/th\u003e\n\u003ctd\u003eBulk bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCleanup\u003c\/th\u003e\n\u003ctd\u003eWashes off hands\/clothing with mild soap and water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp class=\"pb-note\"\u003eFormula claims (waterproof, windproof, permanent-on-porous-surfaces) and the 8 oz. bottle size are as published on Blackline Manufacturing's own site. The 5 lb. bulk size (BL54) is confirmed via chalk distributors rather than Blackline's current site, which currently lists its bulk size as 4 lb. (BL46) - treat the 5 lb. bag's exact net weight as distributor-reported, not manufacturer-confirmed. Source: \u003ca href=\"https:\/\/www.blacklinechalk.com\/home-1\" target=\"_blank\" rel=\"noopener\"\u003eBlackline Manufacturing - Official Site\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/details\u003e\u003cdetails class=\"pb-acc\"\u003e\u003csummary\u003eFrequently Asked Questions\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\n\u003cdetails class=\"pb-acc pb-q\"\u003e\u003csummary\u003eIs this chalk really permanent?\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\u003cp\u003eYes on porous surfaces like wood and concrete - the formula infuses into the surface rather than sitting on top, so it survives wind and rain. It still comes off hands and clothing with soap and water.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"pb-acc pb-q\"\u003e\u003csummary\u003eWhich size do I need?\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\u003cp\u003eThe 8 oz. bottle (B1816) tops up a standard chalk line box. The 5 lb. bag (BL54) is the bulk option for a crew going through chalk regularly.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"pb-acc pb-q\"\u003e\u003csummary\u003eDoes it work on concrete?\u003c\/summary\u003e\u003cdiv class=\"pb-body\"\u003e\u003cp\u003eYes - it's designed for wood and concrete alike.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Product\",\"@id\":\"https:\/\/griffbuildingsupplies.com\/products\/blackline-8-oz-black-permanent-marking-chalk-select-size#product\",\"name\":\"Blackline - Black Permanent Marking Chalk - (Select Size)\",\"url\":\"https:\/\/griffbuildingsupplies.com\/products\/blackline-8-oz-black-permanent-marking-chalk-select-size\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Blackline\"},\"category\":\"Hardware \u003e Tools \u003e Hand Tools \u003e Marking Chalk\",\"description\":\"Blackline permanent black marking chalk, waterproof and windproof for jobsite chalk lines. 8 oz. bottle or 5 lb. bag.\",\"additionalProperty\":[{\"@type\":\"PropertyValue\",\"name\":\"Brand\",\"value\":\"Blackline\"},{\"@type\":\"PropertyValue\",\"name\":\"Colour\",\"value\":\"Black\"},{\"@type\":\"PropertyValue\",\"name\":\"Formula\",\"value\":\"Permanent, waterproof, windproof\"},{\"@type\":\"PropertyValue\",\"name\":\"8 oz. Size (B1816)\",\"value\":\"Refill bottle\"},{\"@type\":\"PropertyValue\",\"name\":\"5 lb. Size (BL54)\",\"value\":\"Bulk bag\"},{\"@type\":\"PropertyValue\",\"name\":\"Cleanup\",\"value\":\"Washes off hands\/clothing with mild soap and water\"}],\"isRelatedTo\":[{\"@type\":\"Product\",\"name\":\"Blackline - Red Permanent Marking Chalk - (Select Size)\"}]},{\"@type\":\"FAQPage\",\"@id\":\"https:\/\/griffbuildingsupplies.com\/products\/blackline-8-oz-black-permanent-marking-chalk-select-size#faq\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Is this chalk really permanent?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes on porous surfaces like wood and concrete - the formula infuses into the surface rather than sitting on top, so it survives wind and rain. It still comes off hands and clothing with soap and water.\"}},{\"@type\":\"Question\",\"name\":\"Which size do I need?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The 8 oz. bottle (B1816) tops up a standard chalk line box. The 5 lb. bag (BL54) is the bulk option for a crew going through chalk regularly.\"}},{\"@type\":\"Question\",\"name\":\"Does it work on concrete?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes - it's designed for wood and concrete alike.\"}}]}]}\u003c\/script\u003e","brand":"Blackline","offers":[{"title":"8 oz","offer_id":55232533889343,"sku":"B1816","price":10.99,"currency_code":"CAD","in_stock":true},{"title":"5 lb","offer_id":55232533922111,"sku":"BL54","price":44.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0685\/4901\/7919\/files\/8oz_black_chalk.png?v=1780437601","url":"https:\/\/griffbuildingsupplies.com\/products\/blackline-8-oz-black-permanent-marking-chalk-select-size","provider":"Griff Building Supplies","version":"1.0","type":"link"}