Constructors Corner.
This is a booklet is supplied by the Health and Safety Excutive and gives information about the dangers of the rosin flux used in solders and the ways to avoid problems.
The booklet is a 20 page PDF file, 83kB in size, and was produced in 1997 but much of the information is still valid today.
If you require Adobe Reader then that can be downloaded (free) from 
Here.
