I am introducing a new regular informative series to Artful Adventures on the subject of Art materials – I’m not sure yet quite how regular this will be, but there are lots of art materials out there, with new ones being introduced all the time so there’s plenty of material to go at (no pun intended).  I thought I’d kick off with canvas, the most traditional ground for painting, which has undergone such a surge of popularity in recent years. Canvas, when used as a support for painting, is usually stretched tightly across a wooden stretcher.  Traditionally, these canvases were then framed, though the fashion today is usually to leave…