A latent printing ink for providing latent, sensitized areas on substrates, which ink can be applied to a paper substrate by a printing press and subsequently developed with a pressure-releasable, encapsulated, color-activating compound carrier on a substrate, characterised in that said ink comprises, based on the weight of the total ink composition, about 5 to 55% by weight of a vehicle component which is a non-polymeric, oleophillic, organic acid anion having a cationic counter-ion, 20 to 30% by weight of a polymeric, hydrocarbon, thermoplastic terpene resin, up to about 70% by weight particulate filler and up to about 30% by weight thinner and wherein said ink includes at least 5% by weight of at least one color-generating component, the ratio of said filler to said non-polymer vehicle component being from about 0.1:1 to 6:1.
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