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Staining Test

In: Science

Submitted By mmeee
Words 325
Pages 2
The staining test is a test for fiber identifycation. The test aims to identify four fiber contents of samples. It is to distinguish four fiber samples A, B, C and D from cotton, wool, polyester and nylon.
The principle of that is to make use of small tuft of fiber samples and treated it with staining agent by dyeing it at short time. When different types of fibers are treated with staining agent, they will produce different coloration due to the differential of fibers construction and degree of staining agent uptake. The chemical composition, morphological structure and reativity of fibers differ from each other leading them to have particular affinity for specific staining agent. Test procedure
i. At first, fiber sample A is taken for test. ii. Put the sample in the beaker with shirlastain A at 2 minues with tweezer and use glass rod to stir the fiber sample soaked into the staining agent thoroughly under room temperature.. iii. Take out the sample from the staining agent with tweezer and rinse it with cool water to wash out any excess staining agent from fiber surface. iv. Examine the fibres for staining and compare the color of the fiber sample with the samples.
Observation of experiment
i. During the experiment, when fiber sample A immersed into the staining agent, it is hard to soak thoroughly. While it keeps the better amount of staining agent after rinsing. Thus, it obtained the deepest color result. ii. When fiber sample B immersed into the staining agent, it absorbs the solution quickly then the others. While most of solution are washing out after rinsing with cool water. Better amount of solution remain fix onto the fibers surface. iii. Differing with sample B, sample C and D absorbs the solution rapidly but most of them are rinsed out by cool water. Sample C fixes with the least amount of staining agent. Both of them result in...

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