=Κustic soda=*Strong alkali *Cleans ovens *Unblocks drains *Strips [[paint]] *Toxic, irritant, can cause serious eye injury. *A relatively high risk chemical, follow instructions with care.
*It is important to add crystals to [[water]] gradually, never the other way round.
*Use rubber gloves, plastic apron, [[goggles]].
*Products containing thickener (eg Ronstrip) are less likely to run off the workpiece, and more effective at [[cleaning]] or stripping on non-horizontal surfaces.
*Paint stripping paste may be made with hydrated lime and caustic soda
*Paint stripping paste may be made with caustic soda & wallpaper paste, (excess caustic can destroy the paste)
==Sodium silicate=dishwasher cleaner
==Washing soda=*Degreases when used with hot water. *Mostly used for clothes degreasing *Unblocks drains. The majority of drain blockages are mostly solidified fat. Half a cup of soda in hot water works well, but use eye protection as it can spit alkali when mixing *Discolours aluminium, and can dissolve it in some cases.
*For greasy washing, a teaspoonful in the machine is plenty, with a hot wash.
==Sodium bicarbonate=aka baking soda or bicarb *a mild safe alkali with many uses
*For brushing teeth, use wetted bicarb like toothpaste. Its abrasive to plaque but not to teeth, and is a stain remover, but lacks fluoride
*Removes tea and coffee stains
*Reduces laundry odour: add to final rinse
*Removes black scuff marks from floors
*Cleans plastic / fibreglass baths
*Freshens sour dishcloths: soak in water and bicarb
*Deodorises laundry awaiting washing: sprinkle in the basket.
*Removes crayon marks: use a brush and soda paste.
==Lime=* Makes an array of [[paint]]s * Used in lime [[mortar]] * Used as plasticiser in [[cement]] mortar * Used for lime [[plaster]] * Occasionally cause extreme burns down to the bone, but usually doesn't burn at all. Be wary of skin contact * Used to crisp pickles, and formerly used for preserving eggs
Lime exists in several forms: * builder's lime: hydrated non-hydraulic lime, good for [[mortar]] etc * hydraulic lime: sets faster & harder, for more specialist uses * Quicklime: non-hydrated, vicious on skin, and can sometimes burst into flame when soaked with water * Lime putty: made by mixing water with quicklime or builder's lime
==Safety=Some alkalis can cause serious eye injury. The damage takes time to occur, so may not prompt a person to seek medical assistance. Major damage can occur. Use eye protection.
Don't mix alkalis with [[acid]]s, rapid reactions may occur, spitting acid or alkali. It can also melt through whatever its in. The same can happen when adding hot water to strong alkali
Strong alkalis should also be kept off skin.