This auction is for 1 Troy ounce of Alloy. This alloy is Bright Yellow. It reduces porosity and enables to obtain shiny and smooth surfaces in a Bright yellow.
You know that you need fine gold to mix with the alloy. So if you were mixing 1 oz of 14 k, you would need .584 oz of fine gold and .416 oz of alloy.
For 18k you would need .75 fine gold and .25 alloy.
The photos show several angles and amounts, this auction is for the alloy only.
Karat in the Measure of the Purity of Gold is as follows;

24K 100% Pure Gold
18K 75% Gold 25% Alloy
14K 59% Gold 41% Alloy
12K 50% Gold 50% Alloy
10K 42% Gold 58% Alloy

Note; This ad is for GOLD ALLOY, it contains NO GOLD. Silver/Nickel/Copper yes but NO GOLD. I know it may seem silly but we have had customers in the past thinking they were buying 24K Gold.