In the wonderful world of wool, some things are hand wash only, and some things are superwash (machine-washable). This is also true with hand dyed yarns. Ginger’s Hand Dyed hosts a wide variety of bases, both machine-washable and not. Unless superwash is indicated in the yarn’s fibre content, you should hand wash. As a general practice I hand wash all my hand dyed knits, but each to her/his own.
Please note that the colour of the yarn is fixed during the dyeing process, but incredibly saturated and intense shades may bleed in the blocking/washing process. This is not an uncommon occurrence with hand dyed yarns, so please don’t be alarmed. If you want to just give the dye an extra wee fix, add a splash of vineagar to the blocking bath. It is especially recommended you add vinegar to the bath if using different colourways together in one project.