Naked Science Forum

General Science => General Science => Topic started by: neilep on 07/02/2011 20:27:33

Title: How Come Can I Erase Pencil From Beneath Ink ?
Post by: neilep on 07/02/2011 20:27:33

Dear Scribeologists,

As a sheepy I of course luff to write......my writings are requested every single day by so many people !  Ewe know...writing autographs is hard work !...but I do put some effort into it...seeing as they pay £20 per signature...and it's not easy using the ' signature-endorsed-stamp' all the time !

Now here is something fascinating !.....I am sure when they read about this in New Scientist it will elevate this to the heights above the quest for the Grand Unified Theory ! !


Here's the knowledge !


Write some pencil on paper thusly


 [ Invalid Attachment ]
Pencil Written On Paper Thusly







Then write over in ink !



 [ Invalid Attachment ]
Pencil Written Over In Ink




Then use a rubber (USA translation service: Don't use a condom cos Rubber = Eraser..sheesh!!) and ewe can erase the pencil BENEATH the ink !!

 [ Invalid Attachment ]
All That's Left Is Pen !!

WOW !!!



How's that done then ?...how can such a feat be performed ? How Can I Erase pencil From Beneath Ink ?


Well, goshy darn !!..I just do not know !!....I want to know though and I guess those who do not know who read this really want to know too !!


So spill the beans !

Hugs and shmishes



mwah mwah mwah



Neil
Executive Officer In Charge Of Asking This Kweschun
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Title: How Come Can I Erase Pencil From Beneath Ink ?
Post by: Joe L. Ogan on 07/02/2011 20:41:45
Very, very carefully.  Thanks for comments.  Joe L. Ogan
Title: How Come Can I Erase Pencil From Beneath Ink ?
Post by: RD on 08/02/2011 06:50:38
Ink bleeds (spreads) into the paper under the pencil marks, so when the pencil marks are rubbed off it doesn't reveal white paper.
Title: How Come Can I Erase Pencil From Beneath Ink ?
Post by: neilep on 08/02/2011 08:37:47
Thank ewe Joe for your comment !

..and thank ewe RD for yours too... so...what you're sating is that the ink get's absorbed by the paper and the pencil just lays on top !...so..somehow the ink must filter hrough the pencil barrier also .....gosh !!

Thanks RD


I must try ths on shiny non absorbant paper too and see what happens !
Title: How Come Can I Erase Pencil From Beneath Ink ?
Post by: RD on 08/02/2011 08:43:53
Quote from: neilep on 08/02/2011 08:37:47
..somehow the ink must filter hrough the pencil barrier

Certainly bleed around if not also bleed through.
Title: How Come Can I Erase Pencil From Beneath Ink ?
Post by: graham.d on 08/02/2011 10:06:26
How do you know that the pencil marks under the ink have gone? Isn't it more likely that you have simply removed the pencil marks that did not get covered by the ink and that the remaining ink-over-pencil marks are indistinguishable from ink marks directly on the paper?
Title: How Come Can I Erase Pencil From Beneath Ink ?
Post by: neilep on 08/02/2011 19:41:39
Quote from: graham.d on 08/02/2011 10:06:26
How do you know that the pencil marks under the ink have gone? Isn't it more likely that you have simply removed the pencil marks that did not get covered by the ink and that the remaining ink-over-pencil marks are indistinguishable from ink marks directly on the paper?


Thanks Graham !

good question and one that i was fully prepared for !.....*looks for notes*...ah..here they are !


Because when the two were combined they were notably darker combined...once I had erased the pencil the blob of ink was considerably lighter in appearance.......and..i did use a sample of just ink as a reference !..
Title: How Come Can I Erase Pencil From Beneath Ink ?
Post by: lightarrow on 09/02/2011 16:33:07
Quote from: graham.d on 08/02/2011 10:06:26
How do you know that the pencil marks under the ink have gone? Isn't it more likely that you have simply removed the pencil marks that did not get covered by the ink and that the remaining ink-over-pencil marks are indistinguishable from ink marks directly on the paper?
There is a way to discover: use blue stylo ink and at the end of the procedure discolour the ink with the specific pen; if now the pencil marks are visible, it means they was under the ink.

I have just made a try of this, and the pencil marks are not present anylonger, so RD's theory is experimentally verified!
Title: How Come Can I Erase Pencil From Beneath Ink ?
Post by: SeanB on 09/02/2011 17:08:27
The graphite smears from the pencil do not penetrate the paper to any appreciable depth, whilst the ink from the pen tends to be absorbed by the paper, to a much greater extent. When you erase you are using a mild abrasive ( mixed in the elastomer of the eraser as a fine powder) to mechanically remove the upper surface of the paper, which also removes the graphite marks from the pencil. The ink is also removed, but to a lesser degree, you will have to use a lot more effort to erase the pen marks, and may even abrade through the paper. The reason you can erase the pencil from apparently beneath the pen is that the line is not really a continuous covering on the paper, but is a series of discrete marks, only blending together when viewed from a distance - use a magnifier to see this on the next sheet.