What's the safer way to do this than to iron the copper plate? It's said to be poisonous
Operate with non-metallic tools, such as bamboo sticks and bamboo chopsticks. Paint lines must be dry before corrosion. Avoid heat generated during corrosion and destroy a well drawn line. Often observe the process of corrosion, once found to have been completed, it is necessary to remove the circuit board in time, so as to avoid corrosion liquid invasion of the copper foil under the paint, causing excessive corrosion, damage to the circuit. After the copper plate is removed from the solution, it is washed with plenty of water. Remove the paint on the copper plate with acetone. Don't use a knife or sandpaper so as not to scratch the copper foil. Then in the copper foil surface evenly brush a layer of rosin alcohol solution.
Paint on the CCL to paint the lines that need to be left. When the paint is dry, dip the copper plate into the ferric chloride solution. After a period of time, the exposed copper foil on the copper clad sheet without paint was corroded. Remove and rinse with sufficient water before removing the paint. Just OK. Note: the container operation in the process of ferric chloride should be used non metal containers, for example, porcelain or glass cylinder in a casserole.
As an amateur of electronic technology, the printed circuit boards were manufactured in this way many years ago.
