Answer: the oils from our hands can be extremely damaging to the paintings
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half black and half white
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You can also use a colorless blending pencil to help blend colors without adding any further pigment. To do this, lay down a fine layer of colorless blender first and then add your lightest color. Dark colors can be difficult to blend once they stick to the paper fibers, so this base helps alleviate that issue. Smudging With Paper and Tortillons
