Back in the day, graphic designers and printers used “non-photo blue” pencils. Certain shades of blue that could not be detected by camera film (or copy machines), so rough drawing lines or notations could be left on the art and would not appear in the final form.This premium pencil features a creamy, soft core that's perfect for blending or shading. A thick core of color lasts long to bring bold statements to life, while a soft lead makes it the best tool to blend in or shade away. Vivid and intense in one stroke and subtle and soft in the next, this pencil is perfect for any project, big or small.