Figure 2: Plates screened for color changes caused by positive lignin-degrading strains. Colonies of B207 (A) and L201 (B) grown on PDA medium containing 0.01% azure B were incubated for 14 days at 28°C, while colonies of B207 (C) and L201 (D) grown on PDA medium containing 0.01% guaiacol were incubated for 7 days at 28°C.