Acetic orcein is used to stain chromosomes in a plant cell so that you can view them easily through a microscope.

Red / Redish pink

Oceto orcein is a stain commonly used in mitosis studies because it helps to visualize chromosomal structures. Specifically, it stains chromosomes, highlighting their shape, size, and number, making it easier to observe and analyze mitotic division. It enhances contrast and allows for better identification and characterization of various stages of mitosis.

aceto_orcein dyes chromatin red. ıt binds to histon proteins at chromatin and shows its structure. nucleoli don't stain with aceto_orcein so chromatins can be seen at clear area.

as a staining agent perhaps...

as we know, cells are hard to see if there is no coloring(stain)