Colored bottle for caps for competition

Is there any problem using a colored cap for competition bottles?  If they are allowed is it still better to not use a colored cap?
I am thinking about the judges possible reactions.

The entry rules will most likely list how the bottles will be presented.  Usually bottles can not have any identifiable markings.  A colored cap could be considered an identifier.

Here is the pertinent language.
“ Container Size & Appearance Requirements (includes bottles & cans)
 Two (2) 10-14 oz. bottles/cans per entry are preferred. Bottles/cans larger than specified measurements below are subject to disqualification.
 Bottles/cans less than 10 oz. are acceptable.
 Bottles/cans must not exceed 9.5” tall and 2.75” diameter
regardless of amount of liquid bottle can hold.
 Bottles, cans, and caps must be free from labels, tape or any
identifying marks. Bottles with raised lettering are allowed, but highly discouraged. Grolsch/Flip Tops/22 oz. bombers are not acceptable.“

This is true, to an extent, but in my experience the solid color ones are fine.  Most of the caps will be gold, silver or black, but you’ll see every color under the rainbow, but multiple people may use orange, multiple people may use yellow, etc.  That said, there are a few “patterned” caps that I’ve seen, white with green hop leaves, pink with hearts, etc etc.  As a comp director I would discourage those caps, but solid colors would be fine.

The way I’ve ready that line is something written on the cap.  Like a name, or a beer style.

I’ve only seen a handful of comps that specify something like “Gold Caps Only”.

Which color do you consider the standard? Silver, gold, black?

As long as there are no identifiers, it is good. I have judged many beers where black magic marker was used to cover the brewers identifying marks.

The entry rules will most likely list how the bottles will be presented.