an explanation in wikipedia: https://en.wikipedia.org/wiki/Breadboardexpelleior said:On a different note I have always wondered why they call breadboards , breadboards. Apparently in the 'olden days' , folks hammered nails into wood boards and connected up their circuits like that. Not sure where the 'Bread' part applies, maybe they used to pinch their mums bread cutting boards to do the job
The term breadboard is derived from an early form of point-to-point construction: in particular, the practice of constructing simple circuits (usually using valves/tubes) on a convenient wooden base, similar to a cutting board like the kind used for slicing bread with a knife..
 Paul Horowitz and Winfield Hill (1989). The Art of Electronics (Second edition ed.). Cambridge University Press. ISBN 9780521370950.
laiza said:one of the best and reliable way of etching a circuit board is to use the presensitized board. What you will do is to have your layout on a white paper and then expose ot onto the presensetized board using florescnet light for a period of time. then soak that on an coastic soda then you will have a perfect etch on your pcb.
Generally you have to worry about disposing heavy metal compounds as used etch solution containing copper. It's a strong biozide, e.g. causing difficulties in a sewage plant.You don't have worry about disposing it, unlike Ferric Chloride