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Onyx graphite pencils from Derwent Pencils Derwent Pencils say, “Our new Derwent Onyx pencil is made from smooth dark graphite and allows you to instantly create dense rich jet-black tones, even darker than a Graphic 9B. Its 4mm wide core has a non-crumbly texture which means it will sharpen and hold a fine point for longer making it ideal for hatching. And, it will smudge allowing you to blend it with your finger tip or a Tortillon. The Derwent Onyx pencil is equally good for quick expressive sketches as well as detailed technical and architectural drawings. If you require really deep tones these can be built up by applying increased pressure. Less pressure will achieve lighter tones ideal for more precise work. Derwent Onyx is available in two tones, Medium and Dark individually or in a blister containing two of each pencil and an eraser.
My comments: Because you can make light and also very dark marks with the same pencil, you just need to take the one pencil out with you when sketching, instead of a small selection of 2H, HB, 2B and 6B. This obviously makes life a lot easier! Also, because they are made of a hard graphite, they don't wear down very much and they keep a sharp point for much longer than a softer dark pencil. It is therefore easy to make thin dark marks with these onyx pencils, unlike with say a 6B pencil that wears down very fast and looses its point.
So why not give them a go. You can get them from Derwent Pencils, or from your local art store.
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