Caucasian high school chemistry teacher demonstrates how to make brass by combining zinc and copper. Here she is firing the zinc coated penny and turning it into brass. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Hutchings, Richard |
Bildgröße: | 5825 px × 4088 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |