{"product_id":"non-photo-blue-pencils-col-erase-pilot-color-eno","title":"Non-Photo Blue Pencils — Col-Erase \/ Pilot Color Eno","description":"\u003cp class=\"p1\"\u003e\u003cb\u003eUnderdrawing that disappears — how non-photo blue works\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe traditional manga production workflow: sketch the composition and panel layout in non-photo blue pencil, ink over the sketch with dip pen and production black ink, scan the page with the scanner set to exclude the blue wavelengths, and the pencil marks are gone from the output — no erasing required. Non-photo blue works because standard photographic scanners (both CCD and CIS sensor types) can be set to exclude specific colour wavelengths when producing a greyscale output. The light blue of non-photo blue pencils falls in the wavelength range that is excluded in greyscale mode, meaning the marks are simply not recorded by the sensor when the setting is applied. The result is a clean scan of the inked linework without any pencil residue, no erasing marks on the inking surface, and no risk of erasing disrupting the ink lines. The technique requires testing on your specific scanner before committing to a project — scanner\u003cb\u003e \u003c\/b\u003ebehaviour varies between models and software.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eCol-Erase versus Pilot Color Eno — which to choose\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe Col-Erase Non-Photo Blue is a traditional wooden pencil — erasable (which is useful for correcting the underdrawing before inking), with a 7.4mm barrel diameter that most illustrators find comfortable for extended sketching. It needs sharpening, which maintains a consistent point size and sharpness but requires a sharpener. The Pilot Color Eno 0.7mm is a mechanical pencil — no sharpening needed, consistent 0.7mm line width throughout, and more portable. The mechanical pencil is preferred by illustrators who want consistency in the underdrawing line width; the wooden pencil is preferred by those who want the flexibility of a sharper point for detail and a broader point for rough blocking.\u003c\/p\u003e","brand":"Inkwell Art Supplies","offers":[{"title":"Col-Erase Non-Photo Blue Pencil","offer_id":53354658398536,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":false},{"title":"Pilot Color Eno 0.7mm Non-Photo Blue","offer_id":53354658431304,"sku":null,"price":0.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/0709\/2808\/files\/Col-Erase_Non-Photo_Blue_Pencil.png?v=1782212864","url":"https:\/\/inkwellartsupplies.com\/products\/non-photo-blue-pencils-col-erase-pilot-color-eno","provider":"Inkwell Art Supplies","version":"1.0","type":"link"}