(US5849073-A)      Pigment for sensing gas leakage comprises particles coated with (hydr)oxide or hydrated oxide of a Pt Gp. metal, pref. Pd.. Particles are pref. inorganic, esp. 0.01-0.5 micron size Tio particles.    Particles are pref. further coated with (hydro)oxide or hydrated oxide of Al, Ai, Ti Zn, Zr, Sn, Sb and/or Ce.    Loading of the Pt Gp metal cpd. on the particles is pref. 0.5-10 wt.% where the cpd. is calculated as oxide.    Pigment is obtd. by: slurrying the inorganic particles in a soln. of salt(s) of the metal(s); adding acid or alkali to adjust the pH to 3-11 to deposit a metal cpd. on the particles; sepg. the coated particles; and heating at 250-600 deg. C..    USE/ADVANTAGE -   By applying to sites as a point to detect leakage of combustible gases such as H2, CO, CH4, C2H2 etc.. Very slight leakages from the site can be detected on a continuous basis    (JP3189013-B2)      Pigment for sensing gas leakage comprises particles coated with (hydr)oxide or hydrated oxide of a Pt Gp. metal, pref. Pd.. Particles are pref. inorganic, esp. 0.01-0.5 micron size Tio particles.    Particles are pref. further coated with (hydro)oxide or hydrated oxide of Al, Ai, Ti Zn, Zr, Sn, Sb and/or Ce.    Loading of the Pt Gp metal cpd. on the particles is pref. 0.5-10 wt.% where the cpd. is calculated as oxide.    Pigment is obtd. by: slurrying the inorganic particles in a soln. of salt(s) of the metal(s); adding acid or alkali to adjust the pH to 3-11 to deposit a metal cpd. on the particles; sepg. the coated particles; and heating at 250-600 deg. C..    USE/ADVANTAGE -   By applying to sites as a point to detect leakage of combustible gases such as H2, CO, CH4, C2H2 etc.. Very slight leakages from the site can be detected on a continuous basis    (JP3189014-B2)      Pigment for sensing gas leakage comprises particles coated with (hydr)oxide or hydrated oxide of a Pt Gp. metal, pref. Pd.. Particles are pref. inorganic, esp. 0.01-0.5 micron size Tio particles.    Particles are pref. further coated with (hydro)oxide or hydrated oxide of Al, Ai, Ti Zn, Zr, Sn, Sb and/or Ce.    Loading of the Pt Gp metal cpd. on the particles is pref. 0.5-10 wt.% where the cpd. is calculated as oxide.    Pigment is obtd. by: slurrying the inorganic particles in a soln. of salt(s) of the metal(s); adding acid or alkali to adjust the pH to 3-11 to deposit a metal cpd. on the particles; sepg. the coated particles; and heating at 250-600 deg. C..    USE/ADVANTAGE -   By applying to sites as a point to detect leakage of combustible gases such as H2, CO, CH4, C2H2 etc.. Very slight leakages from the site can be detected on a continuous basis