Here is the link for Specification O.A. 204, Cars, Light, Reconnaissance (Canadian).
https://heritage.canadiana.ca/view/o...80/752?r=0&s=2
Unfortunately it does not mention the hull colour, other than Hamilton Bridge was to paint the hull in accordance with Specification O.A. 76.(page 19 of the specification)
It appears that it will be necessary to track down Specification O.A. 76.