This is one of the most fascinating, highly specific, and accurate *Nishaniyas* (symptoms) in Lal Kitab.
The 7th house is the house of marriage. Saturn (Shani) is the planet of darkness, restriction, and the color black/blue. Mars (Mangal) and Sun (Surya) represent the color red, and they are enemies of Saturn.
Dr. Sharma warns that if a man has Saturn in the 7th house, he should never gift his wife a red dress, and she should avoid wearing bright red. Whenever she wears red ("laal dress pehnayega"), it triggers a clash of planetary energies, instantly causing severe, unexplainable arguments and fights ("jhagda ho jayega") between the couple!