this is a classic object of microscopy:
chromosomes from the salivary glands of chironomus larvae. The glands have been fixed in Carnoy, and dyed in carmin acetic acid. First pic is the head of the larva, accidently dyed under the coverglass:

chromosomes ( objective 50x, 0.95, plan, oil, eyepiece 10x Leitz periplan)
Bernhard