So, if glass blowers add cobalt to glass to make it blue what do you think must be added to make the following colors?

• Yellow
• red
• White
• Amber yellow
• Fluorescent yellow,green
• Emerald green

Give this some thought then watch the video clip.  After the clip head over to http://wonderopolis.org/wonder/how-do-you-color-glass/ and take a closer look at this process.