כנראה שמאחורי המקלדת ניתן לכתוב הכול
Alloys based upon copper are classified as non-ferrous (ferrous materials are iron-base; for example, steel). Useful alloying additions of other elements to the alloy types listed above in small amounts can include aluminum, arsenic, antimony, beryllium, cadmium, chromium, cobalt, cadmium, iron, lead, manganese, nickel, niobium, oxygen, phosphorus, silicon, silver, sulfur, tellurium, tin, zinc and zirconium. All are found in standard coppers and copper alloys and are added as required in small amounts to give specific properties suitable for many demanding applications.
Some alloying elements have been in use with copper since early times. The development of metallurgical and corrosion science knowledge has provided many answers to specific metallurgical or corrosion phenomena, and these improvements, in turn, have at times lead to the use of other alloying elements with copper. A good example of this synergism is the development of new and improved alloys for use in the electronics industry.
עכשיו תראה לי שקע שעשוי מ 99.999% נחושת טהורה (לא כוונה ל OFC כחלק עיקרי) או כבל אודיו\חשמל כזה.
מוסיפים חומרים לנחושת נגד חמצון 
