Very fresh stains can often be removed by normal washing or by moistening the stain with water and placing in the sun or before a radiator. If not successful, apply a solution of 1 tsp. sodium thiosulphate, (from chemist) in 1cup warm water. Rinse well.
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The verb is has.
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Yes! I recenty spilled some on my carpet and cannot get it out. It left almost like a bleach stain on my carpet.
To stain onion peel cells, you should use a stain called iodine. Iodine is commonly used to stain cells because it binds to starches and glycogen in the cells, making the cells more visible under a microscope.
An investigation into the effectiveness of stain-removing products
The iodine stain solution you're referring to might be Lugol's iodine. This is iodine and potassium iodide in water. The product available in a pharmacy is tincture of iodine which is iodine and potassium iodide in ethanol and water. Please see the links.
It is crystal violet & stains all cells purple.
I just did a lab in biology called "How Plant and Animal Cells Differ" and in the packet it had that question. The answer is: Lugol's iodine stain stops the activity of the cell. It kills whatever specimen it is staining.
Nonstaining iodine is a type of iodine solution that does not contain iodine in a free form that can bind to skin proteins, which is why it does not stain the skin. This means that it is less likely to leave a visible mark on the skin compared to traditional iodine solutions.
Stains from carpet cannot be easily removed with plain water. Stain remover/ carpet cleaner is necessary in order to completely remove it.