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Chemical test for Tragacanth

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Chemical test for Tragacanth Organoleptic test: Appearance: Crystalline                                                          tragacanth Colour: White or faint yellow                                                 tragacanth Odour: None                                     ...
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BLUE MATCHING & WEDGE MATCHING OF CORE & CAVITY

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  BLUE MATCHING & WEDGE MATCHING OF CORE & CAVITY   Blue matching was the final stage of assembly work. It is the process in which both the core and cavity parting surface are matched exactly to avoid plastic flow during moulding (flash free). In this process a thin film of blue was applied on any one side, either core or cavity parting lines. The tool was closed; a slight force was applied and was opened. The high spots where blue is picked up was removed either by diamond file, oilstone or by pneumatic grinders, if it was irregular parting line; otherwise the parting line levels were surface ground. This process is done till blue matches on both halves evenly.               Wedge matching is a process in which wedges are ground and matched to the side cores ensuring efficient locking of side cores with the matching face and at the same time correct matching at the parting surface.    ...
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Chemical test for Benzoin

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Chemical test for Benzoin Objective:  To perform the chemical test for BENZOIN Biological source: It is a balsamic resin obtained from Styrax benzoin. Fam- Styraceae   Physical characteristics: Appearance           - Crystalline Colour                   - Greyish brown Odour                    - Aromatic and characteristics, balsamic Shape                    - Tear Taste                      - sweet and slightly acrid Sr. No. Test Observation Inference 1. Heat 0....
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