Colors of Olympic plates

I have been trying to find what are the standard colors of Olympic plates according to weight but I have yet to find a site that clears it up for good so I was wondering if anyone can help me.
I know that with the bigger plates, it goes like this:
25 kg- red
20 kg- blue
15 kg- yellow
10 kg- green

But what comes after that?
The gym I go to has the same color scheme for lighter plates and it goes like this:
5 kg- red
2.5 kg- blue
1.25 kg- yellow

There is also a 50 kg plate that is green.
I just wanted to know whether this green-red-blue-yellow and then again green-red-blue-yellow progression in weight plate colors is a standard of is this something that was simply done at the discretion of the manufacturer?

The IWF uses the following color scheme:

25 kg red
20 kg blue
15 kg yellow
10 kg green
5 kg white
2.5 kg red
2 kg blue
1.5 kg yellow
1 kg green
0.5 kg white

This is a set scheme and not done at the discretion of the manufacturer.

[QUOTE=kbdub;418003711]The IWF uses the following color scheme:

25 kg red
20 kg blue
15 kg yellow
10 kg green
5 kg white
2.5 kg red
2 kg blue
1.5 kg yellow
1 kg green
0.5 kg white

This is a set scheme and not done at the discretion of the manufacturer.[/QUOTE]

Thanks, thats the info I was looking for. Seems that the plates at my gym were colored at the discretion of the manufacturer.

Yea when plate makers do plates in pounds (bumper or not), it gets all screwed up. It seems to go:
45lbs = red
35lbs = blue
25lbs = yellow
10lbs = green

Annoying.