The invention relates to a negative-working radiation-sensitive composition containing … … a) a compound which forms a strong acid on exposure to actinic radiation, … b) a compound containing at least two acid-crosslinkable groups, and … c) a water-insoluble polymeric binder which is soluble, or at least swellable, in aqueous alkaline solutions, … in which the compound (a) is a 1-sulphonyloxy-2-pyridone.
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