What happens when you block someone on Gmail Chat

Even wondered what happens when you block someone on Gmail Chat. Was thinking on these lines and did a little research and this is what we found out. For starters many of your Gmail Chat friends can become quiet annoying after sometime. Then there are those people you added by accident, who are not pestering you. Whatever might be the reasons' - there comes a time when you want to block a group of people or a single individual. 

Firstly, for those who do not know how to block someone in Gchat. This is what you need to do.

Once you login to Gmail hover over the name of the person you want to block and click the down arrow beside the phone icon.The last option is block, click on that to block a person.
When you block a person this is what happens. When you login to Gmail Chat again - both of you will not appear in each other's friends list or rather will not appear online.Their name might still appear in a grayed out icon.
This will however not affect any emailing capabilities. You can still communicate via email but cannot chat and you do not appear in their friends list.

So if you used to chat often this is one way for the other person to know they have been blocked. Since they can't find you anymore - they will eventually figure out that they have been blocked.