@Ailantd So that you can easily take them out after scanning? :D
You can get magic scanner-invisible pencils too that are in a special blue colour :O
@Curator Oh? So THIS is what my friend does! Saw him sketch with a red pencil a while ago but never thought about asking why he's doing that. So far I've been using normal pencils and erasing them after the lineart is done, but I usually just end up with crinkled paper and smudged lines. 🙈 Will look into these, thanks for the heads-up!
@bestiaexmachina Yeah! IN theory you can use any colour that's not black, then you can selectively remove the colour after scanning, in whatever software you use to touch up, like Krita or Photoshop or whatever. But yes there are also pencils you can get that are invisible to scanners :O
honestly this even works with gray lines (or gray dots?) if you can use a dark ink before photographing/scanning. you just put your black/white threshold between the brightness of the gray you want to eliminate and the black of the ink you would like to keep.
blue makes it easier though
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