n.復染劑；復染色( 指作顯微鏡觀察時使用的一種通過第二次染色使生物標本顯示不同顏色的染色劑)

Gram negative bacteria (e.g.Cyanobacteria) are decolorized, and may be counterstained with other dyes, such as safranin, carbol fuchsin, neutral red. 革蘭氏陰性菌（如藍細菌）則會褪色，但可以被其他染料復染，如堿性藏紅、品紅或中性紅。

Double staining involves the use of two stains;the second is called the counterstain. 復合染色過程利用了兩種染料，后一種被稱為復染劑。

It is often used with a green counterstain such a fast green or a blue counterstain, e.g. hematoxylin.See staining. 使用時常可與其綠色對應(yīng)染料（固綠）或藍色對應(yīng)染料（蘇木精）套染。

Labelling microcircumstance, the size of vessel opening diameter an d counterstain may also affect the result. 標記微環(huán)境，血管開口大小和復染可能影響標記結(jié)果。

They do not fade or damage specimens.Examples include fast green and the counterstain safranin.See also negative staining. 它們不會褪色或腐蝕標本，例如用番紅固綠復合染料對標本進行永久復染。

RESULTS: Primarily cultured cells were colored with CD44 in-situ hybridization, kytoplasm as huffy and nucleus as blue by counterstain. 結(jié)果：原代細胞以CD44原位雜交顯色，胞漿呈棕黃色，胞核經(jīng)蘇木精復染呈藍色。