Zinc-engraving with 3 circular diagrams referring to 3 chemical compositions: H2SO4 (Sulphuric acid), HNO8 (Nitric acid) and Na2CO3 (Sodium carbonate). This composition was printed and published in Dicionário Técnico.
Author:
Paulo de Cantos
Year:
1942
Publishing house:
Não consta
Format (cm):
19,4 x 6,9
Materials:
Metal (Zinc) + Wood
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