I must admit before I start here that I’m not really one for charcoal as a drawing medium. It requires a fair amount of space that it’s alright to be perpetually stained with black. So, you basically need studio space in order for it to be at its peak performance, and I do not have studio space. But, I can take art classes, and that is where most of my experience with vine charcoal comes from. There are quite a few places to buy it cheaply, and the manufacturing process is probably one where it would be difficult to weed out natural inconsistencies. From my experience with several different brands, I have a hard time really telling the difference; but the main ones I’ve gone with is a set from Dick Blick, mostly because they were the last ones I was able to try out.
Vine charcoal is a particularly finicky type of drawing medium that goes down smoothly with a rich black color, and wipes away to nearly nothing with a hand or a cloth (though, if applied directly to paper, even an eraser won’t be able to remove the last ghost of a line). The sticks themselves are essentially raw: they are just vines that have been charred. Most sets (including this one) give you a pretty good selection of widths, all at around the same length. Even the girthiest of these break quite easily and most artists break them down a more manageable size both for this reason and to make manipulating them easier (I personally don’t for the most part, but then again I am persnickety). This particular set performed well. I was able to sketch with ease and clarity, while erasing and blending quickly and as cleanly as possible (and the dust trapped in my cleaning cloth made excellent shading powder in other drawings).
Blick offers a wide range of relatively inexpensive products of quality along with their brand-name selection. These fit in nicely and will get the job done. If you’re already ordering art supplies and want some vine charcoal I’d certainly recommend this (or if Blick is actually your local store)(shipping would probably be too much to make this worth ordering alone). And while there certainly may be better charcoal out there somewhere, you won’t have any problems practicing or finishing drawings with this stuff (just be sure to get a fixative if you don’t want it to disappear).