Gram negative bacteria (e.g.Cyanobacteria) are decolorized, and may be counterstained with other dyes, such as safranin, carbol fuchsin, neutral red.

• 革兰氏阴性菌（如蓝细菌）则会褪色，但可以被其他染料复染，如碱性藏红、品红或中性红。