1. Find the Latin word for the color orange: "luteus".
2. Find Polish words corresponding to the Latin word in a scanned Latin-Polish dictionary from 1644.
3. Find Latin words corresponding to the Polish words in the Polish-Latin volume of the dictionary.
4. If new words found, GOTO 2
The main answer was "fawn", the color of deer. Besides "yellow-red" and "red-yellow", other words were based on red pine mushroom [1], fox, honey, fire, saffron, and gold.
I once answered this question for Polish [0]:
1. Find the Latin word for the color orange: "luteus".
2. Find Polish words corresponding to the Latin word in a scanned Latin-Polish dictionary from 1644.
3. Find Latin words corresponding to the Polish words in the Polish-Latin volume of the dictionary.
4. If new words found, GOTO 2
The main answer was "fawn", the color of deer. Besides "yellow-red" and "red-yellow", other words were based on red pine mushroom [1], fox, honey, fire, saffron, and gold.
[0] https://oslowach.wordpress.com/2018/11/17/jak-sie-przedtem-n...
[1] https://en.wikipedia.org/wiki/Lactarius_deliciosus