Appearance testing

In a recent application, the appearance testing of tablets through measurement of color changes has been automated through the use of fiber optic probes... 

The physicochemical nature of the oil phase components in a cosmetic emulsion, the emollients, determines the skin-care effects, such as smoothing, spreading, sensorial appearance. Test methods have been developed to characterize and classify the numerous emollients available on the market, such as silicones, paraffins, and oleochemical-based products. The latter include glycerides, esters, alcohols, ethers, and carbonates with tailor-made structures, depending on the performance needed (Table 4.8). However, especially with regard to additional effects, there is still a demand for new products with unique performance properties. 

Cool the apparatus in a stream of air and extract the product rom the tube. What is its appearance Test the reaction of the... 

Appearance testing of the tablets is critical during the coating operation. Items to look for include the following ... 

Number of Substance Put Appearance Appearance Appearance Test Tube into Test Tube Before Heating After Heating After Filtering... 

Film appearance Film appearance tests include gloss, color, opacity, color acceptance, and color development. 

Size constancy effects occur during multi-mode examination (Cardello and Segars 1989). The non-existence of perceptual size constancy can affect product appearance testing. For example, the British have been subjected to the persistent advertising claim that smaller peas are sweeter . An unwary approach to the panelling of peas can result in erroneous findings founded upon knowledge of this claim. 

Boil 20 c.c. of a solution of calcium chloride. (4) Did a precipitate appear Test the solution for hardness. (5) What did you do and observe (6) Does boiling soften water which is hard on account of the presence of calcium chloride (7) What is such hard water called ... 

Physical appearance is often a required release and stability test. It may also be assessed by the patient, medical professional, or pharmacist. Appearance can be indicative of instability or an error in manufacturing. In this section, appearance testing of various dosage forms will be discussed. 

Appearance testing for capsules should include the examination of the capsule shell and the contents. The contents are typically either a powder or a liquid. If the contents are a powder, the contents should be examined as a powder described above. If the contents are a liquid, the liquid should be examined under white light to determine if it meets specifications. In either case the contents should be examined for any inconsistency with the product specifications. 

The appearance testing of a parenteral solution has additional focus on the presence of particulates, fibers, or flecks in the solution. Parenteral appearance should be assessed while the solution is in its original container against a white and/or black background. Vials should be held up in front of the background with indirect white fluorescent lighting. The vials should be examined for about 5-15 s. Typical observations are The solution in the vial was clear, colorless, and free of particulates, fibers and any other foreign material . When the analyst is presented with a... 

Pressurized delivery systems include inhalers (meter dose and dry powder inhalers), foams, and sprays. The appearance test consists of two parts the examination of the... 

The NDT temperature test has been used extensively to investigate the conditions required for initiation of brittle fracture and is covered by ASTM E208 [ ]. The NDT temperature is the highest temperature at which a small flaw can initiate fracture at the yield stress. It is a go, no-go appearance test. 

The titration of ionizable chlorides with mercuric acetate solution in the presence of s-diphenylcarbazone as an indicator is used to determine chloride in trichlorotrifliioroethane. A visual appearance test to detect admixtures in halogenated solvents is based on the observation of suspended particles, sediment, turbidity and free floating water. 

Specifications for flexible sleevings will be covered by lEC Publication 684, but only the introductory issue (Part 1 Definitions and General Requirements) of the series has so far appeared. Test methods for the specified features will be included in Part 2. 

Appearance test, the product is inspected visually for color, gloss surface, roughness, cracks, and other... 

During the early days of this program, there was little experience in the economics of coating. As markets began to appear, test materials could be produced on small coaters, operating 10 to 12" wide webs at speeds to 30 ft/minute, but these had a limited relationship to production equipment and conditions. 

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