Why is the lead crystal glass transparent?
156920
First off lead crystal glass is not made of 100% PbO.\n\nLead glass is potassium silicate glass which has been impregnated with lead oxide (from 12% to 28% by weight) in its fabrication.\n\nThe introduction of lead oxide in varing amounts was employed for several purposes the first primary purpose was to design a type of glass that could block x-Rays second it was found that lead also increased the refractive index of the glass, and thus improved lustre, or sparkle.\n\nLead glass's primary contemporary use is in the construction of televisions and monitors. In a standard cathode ray tube, high-energy electrons are fired at phosphors painted on the inside of the tube. This impact creates the visible light the monitor or tv screen produces; it also produces X-rays. The lead in the glass acts as a barrier to this unwanted radiation.\n\nWhen lead glass was artistically cut and used to make table ware such as wine glasses and decanters it was called lead crystal.  Within the last 10 years it was found that  alcoholic beverages stored in a lead crystal decanter was capable of leaching the lead from the glass and contaminating the contents.
371665
Well.. you say white light it's not refracted by glass... Then if that's true, there shouldn't be a rainbow EVER, no?\nThat's the point, white light it's composed by several colors, that's why it's white. When it goes through a glass, it WILL be refracted, causing it to separate into different spectres of light. Of course, only a minimal part of it will be refracted, for those glasses are constructed in such a way to prevent it from doing so.
352065
some is reflected by the glass, and some passes straight through.  A tiny part will go towards heating up the glass itself, as it is absorbed during its transition throught the glass.
197818
some glass reacts to vibrations in a way to make it shatter. (even vibrations you can't feel or hear) Another reason could be that it was previously exposed to severe temperature changes and was not made of tempered glass. any additional temperature changes might be the straw that broke the camel's back and it just broke when the room temp changed by a few degrees
300088
My Guess:\n\nComplete mechanical obscurity is achieved when the user no longer even notices the mechanical ineteraction when working.  Thus the mechanical interaction is transparent or unseen.\n\nOpaque describes something that is completely solid, or cannot be seen through, and is thus very apparent.  \n\nHowever, I can also understand why you might interpret it the opposite way.  For example, when someone talks about "transparency" in recordkeeping, they mean that nothing is hidden.\n\nThus, in one case "transparency" suggests that something is not noticed, while the other case suggests that it is not hidden.
909392
Crystal "defects" can be due to imputities. This is common with diamonds.
639495
Anything is visible beacuse either light emitted from it, or light reflected from it reaches our eyes. If light passes through something completely, it will not be reflected to our eyes, and the object will become transparent or invisible. Glass comes very near this.
385070
Sorry but clear isn't a colour. And i think  a prism is a refraction of light not a reflection.In optics, a prism is a device used to refract light, reflect it or break it up (to disperse it) into its constituent spectral colours (colours of the rainbow). The traditional geometrical shape is that of a triangular prism, with a triangular base and rectangular sides. Some types of optical prisms are not in fact in the shape of geometric prisms.\n\nAs light moves from one medium (e.g. air) to another denser medium (the glass of the prism), it is slowed down and as a result either bent (refracted) or reflected. The angle that the beam of light makes with the interface as well as the refractive indices of the two media determine whether it is reflected or refracted, and by how much (see refraction, total internal reflection).\n\nReflective prisms are used to reflect light, for instance in binoculars, since they are easier to manufacture than mirrors. Dispersive prisms are used to break up light into its constituent spectral colours because the refractive index depends on frequency (see dispersion); the white light entering the prism is a mixture of different frequencies, each of which gets bent slightly differently. Blue light is slowed down more than red light and will therefore be bent more than red light. There are also polarizing prisms (also known as birefringent prisms) which can split a beam of light into components of varying polarization.\n\nIsaac Newton first thought that prisms split colours out of colourless light. Newton placed a second prism such that a separated colour would pass through it and found the colour unchanged. He concluded that prisms separate colours. He also used a lens and a second prism to recompose the rainbow into white light.
1152488
boundaries between crystal grains are less well defined than the actual crystals, and have a different refractory index or optical density.\n\nIn anisotropic crystals, the refractory index or the surface structure of a transparent cut also depends on the orientation of the crystal.
60139
The colored piece of glass will absorb more light which will heat it up quicker.\n\nLight goes right through clear glass. Very little light/energy is absorbed.
857580
Im not sure if your talking about the type of light or the color of the pain on the inside of the glass.  \n\nIf you talking about the light being produced then its because all wavelengths of light are present.\n\nIF your taling about the color of the paint then, its because white does not absorb any wavelengths of light, therefore all wavelenths are given off
153831
Pure quartz is clear and translucent, but natural quartz is typically tainted with impurities, and it takes on the color of those. Here are some examples:\n\n# Amethyst's color is due to an iron (ferric, Fe+3) impurity-induced color center\n# Citrine's color is due to an iron (ferrous, Fe+2) impurity-induced color center\n# Milky quartz's color is due to microscopic air, carbon dioxide, or water inclusions\n# Rose quartz's (crystalline) color is due to aluminum and phosphorus impurities - massive rose quartz's color is due to microscopic and, as yet, unidentified dumortierite-like fibers\n# Smoky quartz's color is due to an aluminum impurity-induced color center aided by natural irradiation
681454
When I was a kid, back in the 1950s, you could buy a liquid called water glass, for preserving eggs.   It was a saturated solution of sodium silicate.   It was colourless and as viscous as treacle.   You'd pour it into a jam jar and carefully place crystals of coloured salts into it, so they'd sink to the bottom.I remember using copper sulphate (blue), cobalt chloride (purple), ferrous sulphate (green), and ammonium dichromate (orange).   After about two days, you'd see coloured threads growing upwards from the crystals.   That's a silica garden.   It's an attractive ornament.
1080506
The glass can be considered as been vitreo. The great difference between glasses and the other materials is high viscosity above of the fusing point. It is characterized by a physical solid behavior with liquid structure, that is, it is a intermediario point between I eliminate it and the solido one and does not possess symmetry. Its moleculas does not hold as I eliminate, that relatively they are joined and nor as solidos that extremely they are joined.  \nI wait that voce has understood.  \nIt forgives for possiveis errors of gramatica, text orininalmente in Portuguese.    \n\nKlarc - student of Engineering of Producão - Brazil
106482
It's the latice structure of the crystal. Also, sugar molecules are a LOT larger than salt.
906783
Good question. The colour of a mirror can be affected by the colout of the glass and the colour of the reflective backing. In most mirrors the glass is clear and the backing is silver so they are nominally silver in colour.\n\nOf course this becomes somewhat comlicated when something becomes reflected in them.
640620
Because the silicon chip inside is light sensitive, so they need opaque casings to keep from stray light from interfering with the proper operation of the device. Some light sensing chips are made with a clear epoxy body and a molded-in lens.