sentence: Most circuit boards are made with a light sensitive covering, for photolithography.
sentences_after: This covering is sometimes called photo-resist. The covering reacts with light. Then the circuit board and covering are put in a developer. Developer is a liquid that dissolves the covering that was exposed to light. Then the board is put in an etchant.
concept_name: circuit board
headings: Printed circuit board Manufacturing Photo-resist
categories: Electronics