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acid action aggregation in open ammonia annealing antimony appearance becomes calcite calcium calcium carbonate carbonate centre colour condition copper crystalline crystalline grains crystals developed diameter drawn ductile ductile metals effect elastic emery energy etched experiments furrows further gases glass surface globules gold films gold leaf granular granules hardened heat hydrofluoric acid illumination lamellae lens lime water liquid magnification mass mercury metal films micro-structure microscope minute mobility molecules movement oblique obliquely reflected observations occurs open formation ordinary temperature particles pellicle phosphorescence photograph pits planished plate platinum polished surface polishing pressure produced radium rays reflected light resolving power ridges rigidity scratches seen shown silver skin smoke films smooth sodium nitrate solid solution solvent specimen speculum metal spicular spicules stage strain structure substance surface film surface flow surface layer Surface Tension Forms tenacity texture thickness thin film tion transmitted light transparent tube vibration vitreous wire