To help clear up some of the confusion around attributes in Octane solaris I put together a video:
https://www.dropbox.com/scl/fi/f1axusbu ... 2yfps&dl=0
Note: Thanks to galleon27 for making me aware the way particles works in solaris is not the way it works in standalone/houdini main (houdini has the option to do either, via vertex color node or instance texture)
Also here an example file:
https://www.dropbox.com/scl/fi/gh0kteez ... 3rfnk&dl=0