I just purchased a grey card for the first time (made by Novoflex).
Almost immediately after purchase it suddenly dawned on me that what was supposed to be a relatively cheap investment could end up being anything but as it was about $30 a pop.
This particular 18% grey card includes both grey and white on one side for each. The grey should hold up for awhile but the white will probably lose its "pureness" in short order.
What happens, however, if my grey card suddenly sinks the mud after being blown by the wind? Would I have to chuck it away or can grey cards be cleaned?
How often do you guys replace your grey cards?