Is there quicksand on the pencil case?

But you can't bring it during the exam. It must be completely transparent, translucent and colored, such as grey yarn and white yarn, not to mention quicksand. It must be completely transparent in plastic.

Cleaning method of pencil box:

1, the most difficult to wash is the ballpoint pen stain, which is an organic substance, so it is insoluble in water, and because of its large molecular weight and strong binding ability.

Washing powder and detergent can't be cleaned. If you have a car at home, get some gasoline and wash it after cleaning. If it doesn't work, you can use 84 disinfectant, soak it for a while and then wash it by hand, but it's slow and tiring. Wash with oxalic acid, the effect is very good.

If it is polluted by ink, there are many ways to remove it. Wash the floating ink with cold water first, then mix it with rice grains and detergent solution and rub it on the ink repeatedly. Then rub repeatedly with a solution of 1 part alcohol and 2 parts soap. Rub the stain repeatedly with glutinous rice granules or toothpaste. Brush with 4% baking soda solution. Mash almonds, Pinellia ternata and eggs together, smear them on stains and rub them for 3-5 minutes.

3, stained with red ink, new traces can be soaked in warm water detergent solution for a while before washing; Wash the traces with detergent first, and then wipe with 10% alcohol.

4, stained with blue ink, new traces can be washed off with general detergent; Chen Ji can be soaked in 2% oxalic acid solution for a few minutes and then rubbed.