So, you have made a horrible mistake, we all do sometimes! You want to get rid of that stray mark or the colour that just doesn't look good. You want to erase that coloured pencil. The first thing to say is, that colored pencil is not very forgiving when it comes to mistakes. Sometimes an error simply cannot be erased completely and the only thing to do is to try and incorporate it into your design or to begin again. So, never experiment with a piece you have spent many hours working on. Save experimenting for practise pieces or scrap pieces to try things out on as you work. Be as careful as you can. The fewer mistakes you make the better. But however careful we are, we all do something and wish that we could undo it. I don't know many colored pencil artists who will say they can completely remove a mistake, but it can nearly always be removed enough to layer new color over it. l have tried many types of eraser and now use only two types of eraser and my favoured method (which isn't actually an eraser at all but works very well). l have a putty eraser/kneaded eraser (don't go buying expensive ones though, these are simply 'Blue Tac'), they remove some of the color, if it is in a light layer, but not much, and l very rarely use it, although it does work well on graphite. The eraser l use all the time is the Faber Castell ink eraser. I personally find the one with the pink erasing core works far better than the one with the white core. The white core seems rougher and can sometimes damage the surface of my paper. The pink cored one also seems to remove more color. Neither remove color completely, but usually enough so that l can work over the error and it will no longer be seen. My favourite method and the one that l use most often is sticky tape. Lay a small piece lightly over the mistake and use a pencil to rub over the mistake. This lifts color very well. You do need to be careful if you do not have many layers of colour down as it can stick to the surface of your paper and tear your paper when you remove it.