Kokuyo Camlin - Experience Darker than the darkest writing with Camlin Supreme 2.0 mm Mechanical pencil. With 4B lead, gives a bold, dark writing. Read more: http://bit.ly/2jVsoG7 | Facebook
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Pentel Sharp HD Mechanical Pencil (1.3mm), Dark Blue Barrel, (1) Super Hi-Polymer Lead Refill (AM13LBP) : Amazon.in: Home & Kitchen
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Extra Dark 2B Automatic Pencil Lead Refills, 0.7mm, 15/Tube - Pack of 3 : Amazon.co.uk: Stationery & Office Supplies
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BIC Velocity Max Mechanical Pencil, Lead and Eraser Refills, 0.5 mm, 5 Count - Walmart.com
Which is the darkest mechanical pencil lead? What mechanical pencil will be dark like a charcoal? - Quora