With the release of nb181 we now have the HTMLContent property block for a label, which has made this demo much easier to deliver, bringing rich text and colour to separate entries in a single label. The new block retains all the html that was applied to a label entry, so that when you use the join block in a list loop to add the next item to the label, the formatting is not lost. in this way I was able to apply different colours to each user (who retained the same colour throughout the chat).

 I also wanted to try out using firebase as a chat store, which of course works well with the "Data Changed" event. 

The demo aia clears the chat when the app opens.