by Wayne Jackson
https://www.christiancourier.com/articles/1445-examine-yourselves
5 Examine yourselves, to see whether you are in the faith. Test yourselves. Or do you not realize this about yourselves, that Jesus Christ is in you?—unless indeed you fail to meet the test! (1 Corinthians 13:5)
The Holy Bible: English Standard Version. (2016). (2 Co 13:5). Wheaton, IL: Crossway Bibles.
12 Beloved, do not be surprised at the fiery trial when it comes upon you to test you, as though something strange were happening to you. 13 But rejoice insofar as you share Christ’s sufferings, that you may also rejoice and be glad when his glory is revealed. 14 If you are insulted for the name of Christ, you are blessed, because the Spirit of glory and of God rests upon you. (1 Peter 4:12-14)
The Holy Bible: English Standard Version. (2016). (1 Pe 4:12–14). Wheaton, IL: Crossway Bibles.
Links from Britannica.com
These provide insight on how metals are “examined” and “tested.”
Periodic Table of the Elements
Sources
Christian Courier
Encyclopedia Britannica