Spraying-pouring test

Think twice before pouring this stuff down your drain or spraying in your oven. It s a strong, caustic substance that causes severe corrosive damage to eyes, skin, and mucous membranes, as well as the mouth, throat, esophagus, and stomach. Blindness is reported in animals exposed to as little as 2% dilution for just one minute. Skin is typically damaged by 0.12% dilutions for a period of one hour. Tests with healthy volunteers exposed to the chemical in spray from oven cleaners showed that respiratory tract irritation developed in two to fifteen minutes. Sodium hydroxide is included as a toxic chemical on the EPA s Community Right-to-Know list. It is also a controlled substance in the workplace, and OSHA has set limitations on concentrations in the air. 

Mandolin s reagent. This reagent is preferably poured on to the plate because of the danger of spraying concentrated acid. Many different colours are given with a variety of drugs (see imder Colour Tests, p.l37). 

The relative mildew growth on polymer and on paint samples exposed to Aurobasldlum pullulans was also studied using the "Zabel Test." In this procedure, veneer strips of southern yellow pine and bass wood are sterilized, cooled, and painted (2 coats with 24 hrs. drying time). After 2-3 days the strips were soaked In distilled water, sterilized at 100 C and placed vertically In 16-ounce French square bottles containing 20 gm. of vermiculite. A mlcronutrlent enriched nutrient media was then poured Into the vermiculite (100 ml per bottle). After sterilization at 121 the painted strips were positioned so that the bottom of the painted zone was 0.5 cm above the vermiculite surface. The specimens were Inoculated with a spore suspension of Aureobasldlum pullulans (16624) by pipette. Incubated two months at 28 , and then rated visually with a 20x binocular. In the weathered series, the specimens were exposed four days In an Atlas Weather 0 Meter (UV and water spray). Representative results are summarized In Table 13. 

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