This invention has an object to process color balance adjustment at high speed in an image forming apparatus without depending on different feeding speeds for different printing materials. Said process covers (after harvesting and removing the roots a comminution step, a holding step of 1-36 hours in which moisture loss is limited, and a drying step. Signals are transmitted to a remote station by wireless transmission such as by electromagnetic waves, radio waves, infrared, sound and the like or by being reported locally by audio or visual transmission. Instrument damage may be prevented in the event of a sideways or backward fall, in at least part, because the neck-brace suspends the headstock between the bottom, sidewall and cover of the case and thereby prevents it from making contact.