There are many kinds of pencils: some have erasers on top; some are colorful. You may have used many kinds of them for many years, but do you know the history of pencils? Many years ago, people in Egypt used lead (铅) to write. Now pencils are made from graphite (石墨) instead ...
No matter what the circumstance, every single graphite grade is not required. Most artists will only need a few pencils to be successful. Because softer pencils have a bit more range, most of the pencils that an artist will use fall on the "B" side of the scale. I suggest the following...
Colored pencils do not actually contain any lead, which may be a surprise to some. Thin, precise, and easy to handle, colored pencils feature awood casing filled with a wax or oil-based inside. Pigment is also added and mixed with water and bonding agents to create the rainbow of colors...
Pencils are classified according to the amount of graphite in the lead. It is generally divided into three categories: H, Hb and B. Among them, the hardness of class H pencil lead is relatively high, which is suitable for objects with relatively hard or rough interface, such as woodworking ...
recommend skipping the pencil phase because starting something that you intend to finish with ink or colored pencil or watercolor with a pencil is a crutch that can be as limiting as a physical crutch you might use if you’d injured your leg. But, graphite can also be an artistic end unto...
Charcoal:People who use graphite pencils tend to find charcoal abrasive; however, it can be used to create stunning effects; when using charcoal, you need to remember that charcoal sticks are prone to smudging and you need to be extra careful so as not to ruin your drawing; you can also ...
Do you know the proverb “no pains, no gains”? It gives the impression that we ought to be suffering while we study. It seems that the only way to know if we’re putting in enough work is how much hardship we bear. We are totally taken up with study, shutting ourselves away for ...
The writing part of the pencil is actually graphite. What this does is lubricates the surfaces of the lock to help reduce the friction from galling. You don’t want to overdo it, of course, because it could cause lock slip. This can be a temporary solution that requires reapplication aft...
@pleonasm - You might want to scan them all in and put them up in a photo sharing website, so that you've got a more permanent archive. Photographs on paper can easily be lost to fire, or mold or flooding. And if you put them on an internet site you can give your other relatives...
INSIGHTS|PERSPECTIVES 6328MAY2015•VOL348ISSUE6235sciencemagSCIENCE A swemovetothedigitalage,wemay forgetthatalotofcorrespondence wasaccomplishedbypencilandpa- per.Nonetheless,whenwedostill writewith“lead”pencils,weare makinguseoftheweakinterlayer forcesingraphitetostripofftinyflakesof graphiteanddepositthemon...