This brush (possibly by association with the idea of painting or colouring) gives us the verb to dye.
Illustrative Text References:
Mohenjo-daro: Seal: M-975 a: Sayid Ghulam Mustafa Shah and Asko Parpola, 1991: Corpus of Indus Seals and Inscriptions: Volume 2: Page 95: Collections in Pakistan: Suomalainen Tiedeakatemia.
Mohenjo-daro: Seal: M-1087 a: Sayid Ghulam Mustafa Shah and Asko Parpola, 1991: Corpus of Indus Seals and Inscriptions: Volume 2: Page 112: Collections in Pakistan: Suomalainen Tiedeakatemia.
Mohenjo-daro: Seal: M-1919 a: Asko Parpola, B. M. Pande, and Petteri Koskikallio, 2010: Corpus of Indus Seals and Inscriptions: Volume 3,1: Page 81: New material, untraced objects, and collections outside India and Pakistan: Suomalainen Tiedeakatemia.
Comment:
Seal M-1919 is damaged, and one edge of this symbol is missing. However, it seems most probable that the original symbol would have matched Mahadevan's sign number 1552.
Image Credit:
Indus Script Sign Number 1552: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.