Advice 1: How to cook starch

Starch paste is an environmentally friendly adhesive, ideal for gluing paper and cardboard. It good paper Wallpapers and light fabrics, theatrical artists like to use it to create scenery and costume designers and artists use it to create masks and figurines made of papier-mache. No matter which starch you take corn, wheat or potato paste can be made from it one recipe.
No matter which starch you take corn, wheat or potato – paste from it cooked one recipe
You will need
  • Starch
  • Water
  • Deep pan
  • Sieve
Mix one part of starch and four parts warm water in a large enameled pot. Stir thoroughly and cover. Leave the mixture to swell for one hour.
Turn on the flame and move the pot with the mixture on it. Bring the paste to boil, stirring constantly with a wooden spoon. Turn heat down to medium, still stirring to Keep the paste on a slow fire until, until it becomes thick and transparent.
Cool the paste to room temperature and pour it in a jar or another container through a sieve to get rid of lumps.
Store the paste in the fridge. The average duration of storage of starch paste – a week. It should be a pleasant food smell and texture, in any case should not be any mold. If you feel a rancid smell or see mold spots immediately get rid of paste.
You can dilute the finished paste with warm water until desired consistency. Diluted paste will need to again pass through a sieve.
Useful advice
For podrabatyvaya bed linen, big skirts are back in fashion, and collars cook the paste in a proportion of one tablespoon of starch in one liter of water. Linen dipped in the resulting solution, dried and ironed slightly damp. To starched fabric glittered to the solution add one coffee spoon of salt.

Advice 2 : How to recognize starch

You urgently need to cook the paste, and you remember that somewhere in the closet was the starch? But on the shelves revealed several packages of white powder - which one to use? Determine this is possible by chemical means. Suitable for determination of starchand a substance probably have in your home medicine Cabinet.
Classic chemical experience - determining the presence of starch in potatoes
You will need
  • Alcoholic solution of iodine
  • Pipette
  • Saucer or glass outlet
  • The concept of reactia and indicator
Carefully open the package with white powder. Type it with a spoon and place on a saucer or in a chemical test tube. In this case, no matter whether fall into the vial moisture, but in General dishes should be dry.
Clean and dry pipette, type a drop of an alcoholic solution of iodine. Drop of iodine on a white powder. If the powder contains starch, the powder from white to dark blue or even purple, depending on the concentration of iodine. Starch and iodine always react on each other in a similar way, so the chemistry books write that the iodine is recation for the presence of starch, and starch is a digital counter of the presence of iodine.
In addition, experience with the starchohms and iodine is a great way to interest children chemistry. Check which foods have starch. For a home experiment children can be, for example, take a potato, Apple, piece of bread. Potato or Apple must to be cut, and from bread to make a lump. To determine which product the starchand most of all. It's easy to figure out, if you take iodine the same concentration. Starch more where the blue color will be more intense.
Since you don't know what powder got in your hands, operate it with care, as it is necessary to work with chemicals. Collect it with a spoon, not your hands..

When working with chemicals need to comply with safety rules. For example, the powder should not get into the respiratory tract. Starch, of course, no serious harm will not cause. However, you have to be sure that the substance is safe.
Useful advice
Instead of the saucer it would be better to take chemical the dishes, but she is hardly at home or at the cottage. But if you have a handy vial — take the best of her. Pre-need her to wash, boil and dry.

Advice 3 : How to cook a paste of starch

Despite the wide range of different adhesives in the shops of building materials, home-made starch paste is still very often used for insulation of Windows, applications of paper and cardboard, priming the walls and pasting their Wallpaper. It has its advantages – transparency, thanks to which even on the most delicate and the white paper does not remain the ugly yellow stains. If you want to subsequently remove the paper covered with pasteohms, this is easily done using hot water.
You will need
  • - Potato starch;
  • - sieve;
  • - warm water;
  • - boiling water;
  • - capacity for dilution of paste;
  • - kettle
  • - spoon or stick for stirring paste;
  • the colander;
  • - gauze;
  • - carpenter's glue or PVA glue (if necessary).
Prepare the starch for the preparation of the paste. To do this, you must carefully sift it through a fine sieve to eliminate the appearance of tool indissoluble lumps and mechanical impurities. After that, pour the prepared raw material is warm water and mix well to make a batter (like for pancakes). It is important to correctly calculate the required amount of starch. Usually in a bucket of water is sufficient kilograms of dry powder.
Start typing in the starch slurry the boiling water, brewing the paste. The stream should be thin and not be interrupted (for example, pour water from the spout of a teapot). Stir the mixture until it becomes homogeneous. To interfere requires an intensive, long stick or spoon to break up resulting in mass clumps. Even if the paste in a pot already brewed and will be transparent, continue to add the remaining amount of boiling water. Please note that during cooling, the solution thickens.
Strain fresh hot starch paste through a piece of cheesecloth laid in a colander. You can use a fine sieve. It is impossible to prevent lumps in the adhesive composition, otherwise it is bad for the results of your further work. If properly cook the paste of starch you could not, dissolve a large number of lumps in a water bath. After this procedure, the solution should be filtered.
To correct the disadvantage of the pasteand poor resistance to moisture and to improve its adhesive ability you can use those or other industrial additives. The composition would be better to grab if in a bucket of fresh pasteand put a Cup of wood glue (diluted in water) or PVA glue. The prepared mixture can serve as a good primer even on the wall surfaces previously painted with oil paint. But do not forget that working with industrial additives, have carefully enriched their starch paste can leave contamination on a light paper surface.
Useful advice
Accurately calculate the required amount of raw materials to prepare the paste. In a ready solution as you work it will be impossible to add neither a dry powder nor boiling water. On the second day adhesive strength of the composition will decrease so don't do reserves - better covariate it as necessary.
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