Watch the following video.
So, what do you think adds color to all the wonderful glass pieces you saw in the video? Lets find out. Our first stop will be looking at the substances used to color glass. Below you will find a chart with the chemicals used in the productions of colored glass called pigments.
Glass Pigments
| Compounds | Colors |
| iron oxides | greens, browns |
| manganese oxides | deep amber, amethyst, decolorizer |
| cobalt oxide | deep blue |
| gold chloride | ruby red |
| selenium compounds | reds |
| carbon oxides | amber/brown |
| mix of mangnese, cobalt, iron | black |
| antimony oxides | white |
| uranium oxides | yellow green (glows!) |
| sulfur compounds | amber/brown |
| copper compounds | light blue, red |
| tin compounds | white |
| lead with antimony | yellow |
So, how does this work? Go to this next site to read how this process takes place and why the elements work to create the colors. One thing you will notice is that the process of making colored glass is not as simple as it looks. There are many parts to the process, like temperature for example, and if that is not exact, you may not get the color you expect. Use the worksheet your teacher has provided to help guide you in your travels through the web page. Come back to this page when you are finished. Click here to get there.
The video below will show you how the "recipe" for making glass is put together. It will also discuss the different elements that are added to create the color. While watching the video, answer the following questions.
1. What three main ingredients are used to make glass?
2. Explain how the recipe is put together. How is it measured? How do they know what to add?
3. How do they assure that the "batch" is mixed thoroughly?
4. Once the batch is mixed, what do they do with it and how?
5. How long does it take for a batch to melt in the oven?
In the next video you will see how they are adding color to the glass but it is not a pigment. What do you think is different about the video below compared to the video on making a "batch" of colored glass?
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