#1 Pink
The softend end (pink/orange/red) is used for light grades of paper which the hard gritted side would tear apart, and also for precision erasing, such as removing a light stray mark from among dark marks.
#2 Blue
On grainy art paper, pencil marks are more difficult to remove. The blue end of the eraser is tougher and better to use in those cases.
Read more @ my channel
http://www.channelthreesixtyfive.com/apparently-the-blue-part-of-the-eraser-was-never-meant-to-erase-pen-marks-here-s-what-it-s-for?v=l8x526XEixpFRRAXrmhtkvQB1BPjDX0pS4E1mmt&page=2
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