For observing chromosome aberration, treated allium cepa root tips were stained with Acetocarmine and destained with 45% acetic acid. But while obseving under microscope, cytoplasm is also stained. Staining time was 3-4 h.
Try with 0.05% HCL. Rinse the slide first in two dips and then adjust it by try and error method.
Instead of acetocarmine, you can go with "Feulgen staining" which stain only nucleic acid.
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