Other problems such as metallic impurities at the Monte Cristo concentrator and the Klondike.
2.
Some amber, often depending on metallic impurities, is deep red, green or even blue.
3.
This allows the metals to be separated from the various non-metallic impurities in the rock.
4.
A number of local mines produce'dirty concentrates'that contain metallic impurities that cannot be separated by the flotation process.
5.
RCA-1 clean in ammonia-peroxide solution removes organic contamination and particles; RCA-2 cleaning in hydrogen chloride-peroxide mixture removes metallic impurities.
6.
In general, the process must be controlled more closely than in hexavalent chromium plating, especially with respect to metallic impurities.
7.
The copper used during the years in which Classic Head cents were minted was of a higher quality, containing less metallic impurity.
8.
The slate from these quarries was pure and free from metallic impurities, which meant it was in demand as other slate demand fell.
9.
This solution is subjected to a number of liquid-liquid extraction steps to remove metallic impurities ( most importantly niobium ) before being treated with potassium fluoride to produce K 2 [ TaF 7]
10.
Detailed analysis of the pieces of the turbine disc found several metallic impurities on the edges of two of them; in one case, they were identified as coming from the engine nacelle, in another, the impurities came from the nacelle, the hull, control actuators and finally, electrical cables.
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