Spores do not stain easily. perhaps you have seen them as unstained white objects inside bacillus species in other staining procedures. if they are visible as unstained objects in other stains, of what use is the endospore stain?
Endospore staining is used to stain the spore which reside inside the microorganisms, and unlike the exospores, are not present outside the microbial cells. The endospore stain penetrates the microbial cells, and then stain the endospore.
