How will you use a gold leaf electroscope to find out whether the charge on a charged body is positive or negative?

Gold leaf electroscope is used to detect the type of charge present in a charged body by the following method:

1. Take a charged gold leaf electroscope (Suppose the electroscope is positively charged).
2. Bring the charged body to be tested in contact with the brass disc of the electroscope.
3. If divergence of leaves increases, the body has positive charge.
4. If divergence of leaves decreases, the body has negative charge.

For the case when electroscope is negatively charged, if divergence of leaves increases, then body is negatively charged and if it decreases then body is positively charged.