Both Iodine and Methylene Blue will work - iodine is probably used more often for onion.
The gram stain uses a decolorizing product so it is possible to differentiate between the gram and the gram cells. Gram positive cells stain purple in color.
it helps 2 c objects more clearer in da microscope
safranine stain is used to stain onion cells
iodine indicates polysaccharides, therefore plant cells can be stained with iodine, staining the chloroplasts- composed of starch(a polysaccharide), and the cell wall- composed of cellulose ( a polysaccharide)
because they're are starches in the leucoplast
To stain the starch in the leucoplasts so they are visible
aqueous iodine in the form of potassium iodide turns purple in the presence of starches in water.
It is crystal violet & stains all cells purple.
The iodine stain can be removed from the paper by washing the stain in plenty of cold water. Paper distillation can also be used to remove the iodine stain from the paper.
If iodine is not applied, both the gram-positive and gram-negative stains will appear to be gram-negative. The iodine acts as a mordant that helps to fix the crystal violet stain in the gram-positive bacteria, making them appear purple. Without iodine, the crystal violet stain can be easily washed out of both gram-positive and gram-negative bacteria, resulting in a pink or red color.
It is either iodine and it stains starch, or the other way around, starch that stains iodine, likely the former as it is biological. Starch or iodine can be used in chemical titrations also to indicate the presence of the other available in solution.
Stain . Iodine is one.
Iodine work as a modrant which helps in fixing the stain properly by making a compled compoun of stain and cell wall.
The resultant crystal violet- iodine (CV-1) complex serves to intensify the-color of the stain. At this point, all cells will appear purple black.
Iodine stains starch contained in cells. Iodine is also used to distinguish between Gram negative and Gram positive bacteria. The Gram stain contains iodine.