A short instruction on how to freeze a bubble.
Bubbles are frost-resistant. They freeze at the temperature of 7 degrees Celsius below zero. Their film is so thin you can accurately place a bubble on a snowflake to turn it into an icy ball.
The snowflake touches the bubble making ice crystals head in all directions away from the place of their contact. This is the same type of ice crystallizing as of a snowflake. Thus you can select a snowflake with the desired shape before creating your icy bubble.
The temprerature should be below zero in order to freeze a bubble.
If you act carelessly your icy bubble will burst.
There is another way to freeze a bubble. You can gently blow it on fresh loose snow.