Red złoty (Polish: czerwony złoty; also known as Polish ducats or florins) refers to circulating gold coins minted in the Kingdom of Poland (later, the Polish-Lithuanian Commonwealth) from 1526 to 1831. Whereas złoty "(adj.) gold(en)" could simply refer to the colour, czerwony (red) specified the material as gold.
The red złoty was different from the Polish złoty proper, which was the money of account adopted during Alexander's reign in 1496. To combat the confusion and inflation resulting from the different coinage used in the Kingdom of Poland, Sigismund I the Old around 1526-1528 introduced further monetary reform, which included increased minting of the red złoty in Kraków. From 1528 the new monetary system was used in the Polish province of Royal Prussia, and in 1569 (following the Union of Lublin and the formation of the Commonwealth), in the Grand Duchy of Lithuania.
The red złoty was minted at 3.5 grams of gold. There was also a silver złoty, worth 23.1 grams of silver. In 1526 a monetary scale was introduced in which 1 złoty = 5 szóstaków (sixpences) = 10 trojaków (threepences) = 30 groszy (groschen) = 90 szelągów (shillings) = 180 ternarów/trzeciaków (ternarii) = 540 denarów (denarii).
The value of one red złoty in terms of accounting złotys increased in time, while at the same time the amount of silver found in the grosz decreased. for example, in the 16th century the red złoty's value rose from the initial 30 grosze to almost twice that in just a few decades; in the mid-17th century it was worth six accounting Polish złoty (180 groszy), while in late 18th century one red złoty was worth about 18 Polish accounting złoty (or 540 groszy). | 
