You can easily send dividends to any holders of colored coins. This can be done in just a few clicks. In your Coinprism account, go to the “Send coins” tab and then click “Send dividends” or visit this page.
1. In the “From address”, select the address from which you want to send the Bitcoins (or colored coins) from.
2. For the “Asset ID” you need to enter the colored coin address (starting with a "A"). The coin holders of that asset will receive the dividends. You can click on “Addresses” to see the colored coin addresses from your Coinprism account.
Note that you don’t need to own the colored coin issuing address to send colored coins to coin holders.
3. Finally, you enter the amount of Bitcoins (or colored coins) you want to send to the owners of that colored coin specified in the Asset ID field.
Coinprism will then calculate how many Bitcoins (respectively colored coins) is each colored coins entitled to, and prepare a single transaction paying all the owners of the coin. The transaction is a normal Bitcoin transaction with multiple recipients.
Optional: It is possible to select at which point in time (specifically which block number) shareholders are considered. If you select the last block of June, every address who owned the coin at the end of June will receive the dividends, even if they since sold them. This is possible because the Blockchain is a full historical ledger. To read more about sending dividends at a particular height, read this article.
Read this article to see all the addresses holding particular colored coins.