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When these glass fragments were submerged in water they clearly showed their beck lines. Meaning that their refractive indexes differ.

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Unlike the vegetable oil the Clove oil has a refractive index of 1.53 which closely correlates with the window glass fragment. Making is less visible.

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Tempered glass has a refractive index of 1.543 which is close to that of Clove oil(1.535)Making is almost completely invisible while submergered.

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This Lead crystal glass shard had a refractive index of 1.3 which was similar to that of the clove oil(1.53) But is didnt making it completely see through/

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Again we can see that there are no visible beck lines and the refractive indexes are similar.

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Different refractive indexes make the beck lines show more.

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Alike refractive indexes

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Refractive indexes are similar, making the Pyrex glasses beck lines less visible.

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Beck lines are clearly visible meaning that the refractive indexes are different.

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Here we see some broken lead crystal glasses. Lead crystal glass is mostly used to store and serve drinks, but due to the potential health risks of lead, this is rare nowadays.

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Here are some shard from broken beakers used in labs.

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This is a back side picture of a glass shard. We can see in this picture that it is indeed the back side because of the smooth surface and it doesn't any have physical cracks on its surface.

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Another perspective of the shard.

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This whole glass was broken by hammer and nail. It was struck three times along side on the vertically placed tape. There are visible number indicating which crack originated first.

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This chunk of glass was broken by a hammer and nail. There are visible redial cracks on the right side of the glass. We can tell that this is the anterior part of the shard due to the fact of the cracks physically being felt on its surface.

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Here are some fractured pieces of glass in which the point of force is visible in the top section of glass.

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Picture of radial cracks and the concentric cracks.Taken at a 90 degree angle. The radial cracks are the first to form. Only one point of force is seen.