| 21. | The practical colors included Prussian blues and graphite grays.
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| 22. | The new colour was first called Berlin blue, but later became known as Prussian blue.
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| 23. | In other words, Prussian blue is considered as an integral part of precision tool making.
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| 24. | Painted surfaces could be scraped, while floors were treated with acid and Prussian blue mixtures.
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| 25. | "The Stonemason's Yard " is a very early example of using Prussian blue in oil painting.
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| 26. | But until now, national stockpiles of Prussian blue pills have been limited, and bought from overseas.
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| 27. | Hg ( CN ) 2 can also be prepared by mixing HgO, finely powdered Prussian blue.
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| 28. | Prussian blue was the first modern synthetic pigment.
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| 29. | They also provided backing on two tracks for Richard Clapton's debut album " Prussian Blue ".
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| 30. | The standard is coated with a very thin coating of a material such as Prussian blue.
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