Streak strains to be printed for single colonies.
Prepare a printing Master Plate. Place a Grid Sheet under the base of a sterile plate. Typically, the grids contain 24 or 50 squres, but grid between 9 and 121 squares have been used. Use a grid system of the appropriate size for the number of strains to be printed. Pick a single colony of each strain and hatch an 'X' shape in the middle of a grid square.