Before revision: By controlling the pressure and temperature applied to phenol and formaldehyde, he found in 1905 he could produce his dreamed-of hard mouldable material (the world's first synthetic plastic): bakelite.
After revision: By controlling the pressure and temperature applied to phenol and formaldehyde, he found in 1905 he could produce his dreamed of hard mouldable material (the world's first synthetic plastic): bakelite.