At another forum, about Russian pre-dreadnoughts, there was a long thread about just what color those yellow funnels actually were.
It turns out ... apparently no one really knows.
The original paint specs were very vague, (basically "mix yellow ochre and black"), and there is no historical standard for what color yellow ochre is (it ranges from yellowish to amber to almost rust).
There are many surviving first-hand descriptions of the color, but they are highly contradictory, ranging from "yellow" to "olive" to "cinnamon". There are a few period paintings and posters, one that appears otherwise accurate shows a reddish-cinnamon hue.
Lacking color period photos, it's hard to say. Curious mystery.