noun
diazotype; diazo copying
Technical term for a photocopying process using diazonium compounds, often used in engineering and architectural blueprint reproduction.
ジアゾ複写は青焼きとも呼ばれる。
Diazo copying is also called blue-line printing.
A common colloquial term for the same diazo blueprint process, emphasizing the blue-tinted output.
From English 'diazo' (referring to diazonium compounds) and 複写 (copying).