[split] Color annotations

[Mauro]

This is what seems to have happened.

Latin RŬSSUS  /ˈrʊssʊs/-> short Ŭ becomes /o/
Proto-Romance *rossu(s)-> final vowel lost in Friulian and becomes Friulian ros

The Italian and Friulian words therefore seem to share the u → o development.
What distinguishes Friulian here is principally the later loss of the final vowel.

So, you are correct, the change did not come with apocope alone.

I was looking into because the "Rot" written on the page you proposed, could be red also as ros?

References: 
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Thanks for the links!