if you're wondering why the hydraulic shaft is gold-colored and not chrome, it's because high friction-resistance hydraulics sometimes use titanium-nitride coating, which is very close to this in color.
To get as close to the color as possible, I treated the shaft with a dilluted dark grey wash after painting it and allowing it to dry for a day. The decent metallic paint (the kind which doesn't look like glitter) actually dries incredibly fast.

The dark grey wash fades the gold tint slightly, which brings it closer to the actual titanium color I was trying to get.

On the claws, the same material can be assumed.
The cylinder bodies are now yellow, because it looks better overall.