| http://www.w3.org/ns/prov#value | - The plates from which the printing reliefs are prepared usually contain photoinitiators, i.e. compounds which decompose into radicals under the action of light and which start or accelerate the polymerization, for example vicinal ketaldonyl compounds, such as diacetyl or benzyl; ot-ketaldonyl alcohols, such as benzoin; acyloin ethers, such as benzoinmethyl ether; a-substituted aromatic acyloins su
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