Is this gold 14k fill?

Yes, 14 /20 means the wire/jewelry has composition of 14karat purity gold and 20 means the amount of gold is 1/20 (or 5%) by weight of the wire/jewelry. Copper is commonly the main metal used in 14/20 gold fill wire/jewelry, since it is readily available, has a similar melting point and durable.

What kind of solder and flux should i use with this? gold, siver solder? flux paste or solder/paste combo, etc? and will it tarnish over time?

You can use either one that easy for you: wire, sheet, chip or paste solder. Also depend on what kind of project that you are working with. There are different kind of solders that you can use for example gold filled, yellow silver or paste. I think the most convenience one would be solder paste that contains flux.

What is in the inside? Brass, copper, or silver?

This gold filled wire is brass core.

What does 14/20 mean?

In this reference, the 14 refers to 14 karat gold coating permanently bonded over the core or base metal (brass, bronze, etc). The 20 refers to 1/20 which refers to the ratio of 14 karat gold layer to base metal layer by weight. The wire is 1/20 gold and 19/20 brass or base metal.

20 Gauge, 14/20 Yellow Gold Filled Wire Half Hard Round 14K Gold Filled Made in USA - 5FT by CRAFT WIRE

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