Talk:Grease pencil

Fabrication

How they were historically made?. How can they be made at home?. How are they made in the industry?. Regards. --Nopetro (talk) 19:55, 5 November 2009 (UTC)[reply]

Wax or grease?

The first draft(?) version of this article states that this type of pencil is made of hardened coloured wax. Is that correct?

My experiments suggest that the coloured core of the pencil is actually a blend of oil and pigment, not wax. (At least for the brand of pencil described below.)

Using a black Royal Sovereign Chinagraph pencil I am exploring methods of blending, spreading, removing and fixing the black marks on paper, for artwork sketching and drawing.

The black marks can be removed easily by washing in cold soapy water. That is not what would be expected from a wax, but is typical of an oil or grease I believe.

Heating a drawing made on paper could be expected to make the black marks soften, spread or soak into the paper when any wax binder melts. But that is not what happens with the Royal Sovereign pencil. Heating on a domestic cooker hot-plate, or with a hot air gun, the black material gives of a little smoke but remains completely solid right up to a temperature where the paper begins to scorch. After cooling the black marks appear unchanged. Rubbing with a fingertip reveals however that the black material is now much less smudgy. It has become "fixed" to the paper.

My hypothesis is therefore that the Royal Sovereign pencil is a blend of oil and pigment. The oil component does not melt on heating, as a wax would. Alone, it would be a liquid at normal room temperature. When mixed with solid pigment particles the oil forms a binder holding the mixture together as a solid mass - i.e. a "grease". (Hence the name "grease pencil".)

If marks made on paper are heated sufficiently for any oil component in the mixture to vaporise or oxidise then that would explain why the marks loose their smudgy characteristics and become "fixed". That is extremely useful knowledge for an artist - even if I have guessed wrong about how it occurs :).

AndyNewton (talk) 18:11, 31 July 2010 (UTC)[reply]

Hydro Marker??

This should probably be added to this page, I have been looking all over the web trying to find the difference.

They ARE water soluble, as opposed to the China Markers. They have gotten big for applications like different types or recreational scoreboards. It can just be erased with a damp cloth. —Preceding unsigned comment added by Tclem (talk • contribs) 04:39, 23 September 2010 (UTC)[reply]

External links modified

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Purpose of second image

I'm not sure what the second image here is supposed to be. Were the marks on the map made by a grease pencil? If so, maybe the description should be a little more clear? Bpmurphy (talk) 05:38, 8 December 2021 (UTC)[reply]

[1] says A map marked with crude chinagraph-pencil in the second decade of the 20th Century shows the ambition - and folly - of the 100-year old British-French plan that helped create the modern-day Middle East, making it sound like these two guys really did just get out a map and draw some lines over lunch. But I don't have a serious scholarly source on that (not that I looked very hard at all), and it's such a great story that I think we need to view it with great suspicion until we have one. So probably the image should be removed for now. E Eng 06:01, 8 December 2021 (UTC)[reply]