Wilson's Dictionary of Bible Types
Zechariah 6:3 (b) It is quite evident that these horses of various colors represent various types of GOD's curse and judgment. They probably represent the same four judgments that are mentioned in Ezekiel 14:21. It is difficult to state definitely which judgment is represented by the grisled horses. Certainly it is something that is a curse to Israel.
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Watson, Walter. Entry for 'Risled'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/r/risled.html. 1957.