Stains on fabrics – Copy pencil ( tracing paper)
Copy pencil ( tracing paper). In the case of wool and natural silk, the stained place is moistened with water, then sprinkles with citric acid, and finally rinses with warm water. You can also try to remove these stains with an alum solution, then rinse the cleaned place thoroughly with water. If gasoline soap is available, then rub it carefully on the stain, leaves for some time on the surface of the fabric, and then the stained area is rubbed with gasoline, without adding a drop of water. On white silk fabrics, you can try to remove stains with warm alcohol or. bleach. Artificial viscose silk, and acetate fabrics are stained with methylcyclohexanol, and then wipe the stain several times with gasoline.
White linen and cotton fabrics are first treated with hot glycerin, and then washes out the agent carefully with clean water. Then - as needed - bleach is applied, potassium hypochlorite solution or other bleaching agent. You can also dissolve the remaining stain with pure alcohol. Finally, rinse the stained area thoroughly with warm water. Another method of removing these stains from white fabrics is to use a mixture of dilute hydrochloric acid and alcohol. It does happen though, that the fabric will be damaged during this treatment, especially then, when it is performed too slowly, when the neutralization of hydrochloric acid and alcohol with ammonia solution is neglected, and finally - when the stained fabric is not properly rinsed with warm, clean water. This is especially true of fabrics made of viscose fibers. If the stained fabric has been washed many times in water, then it is very difficult to remove stains from it, nearly impossible. There are two more methods, the use of which ensures the removal of any stains from pencils and tracing paper. Both of these methods, however, require whitening agents, which discolor fabric fibers. Therefore, these methods are not suitable for wool, materials made of polyamide fibers and natural silk, as well as colored products. However, the discussed methods can be applied to products made of strong linen fabrics, like for example. work coats, laboratory etc..
The first method of removing stains from copy pencils and tracing paper is to soak the stained area of the fabric with a solution of potassium permanganate and a few drops of dilute hydrochloric acid.. In turn, the action of hydrochloric acid is neutralized with ammonia, then treated with bleach or sodium disulfide, thus free chlorine is bound * The end of the treatment is thorough rinsing of the fabric with water. A belief that is sometimes widespread, it is possible to remove stains from a copy pencil with sodium dithionite alone, is completely wrong.
The second method is to use dilute nitric acid. Nitric acid is one of the strongest inorganic acids; it whitens and breaks down organic substances. Here, too, the point is to quickly remove the stain and immediately soak the stained area with drops of ammonia., the fabric is then rinsed for a few minutes under running water.