Calcium carbide in its natural form. The pure material is colorless,but most samples have a color ranging from black to grayish-white,depending on the grade | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Camazine, Scott |
Taille de l’image : | 5146 px × 3418 px |
Model Release : | Non requis |
Restrictions : |
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