Blue Part Of The Eraser Isn't For Erasing Pen Marks, This Is What It Is Used For...

OMG! I wasn't aware about it.

Blue Part Of The Eraser Isn't For Erasing Pen Marks, This Is What It Is Used For...
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I was just shocked to read the fact that the blue part of the erasers is not actually used for erasing pen marks. Well, we all grew up thinking that they erased pen marks and many of us probably tried it too and ended up making a complete mess out of it. 

At that time, we didn't realise what was its true use but seems like we have an answer now. Here's what the blue part of the eraser is used for.

I always thought the pen sign stamped on the blue side was for erasing pen marks. 

I always thought the pen sign stamped on the blue side was for erasing pen marks. 

How wrong I was! 

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We grew up thinking that the blue part was meant for erasing pen marks. 

We grew up thinking that the blue part was meant for erasing pen marks. 
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But here's the difference between the red part and the blue part. 

The red part is used to erase pencil marks on light paper. 

The red part is used to erase pencil marks on light paper. 
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The red part is actually the delicate part of the eraser so it can be used to erase pencil marks on light paper that will tear easily.

The blue part is for erasing pencil marks on grainy paper. 

The blue part is for erasing pencil marks on grainy paper. 
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The blue part of the eraser seems to be slightly tough in the making material, so it was used to erase pencil marks on thicker paper without tearing it. 

So, why on earth is there a pen's symbol on the blue side of the eraser? 

So, why on earth is there a pen's symbol on the blue side of the eraser? 
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This question has been bugging me like crazy! 

As it turns out, the blue part was used to erase dark marks on heavy grade paper. 

As it turns out, the blue part was used to erase dark marks on heavy grade paper. 
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But people started using it to erase pen marks as well. And it seemed to work too. 

Were you aware of the difference between the red part and the blue part of the eraser?