Coating liquid for forming a transparent coating and substrate with a transparent coating

A coating liquid for forming a transparent coating, consisting essentially of SiO2 and:

• (A) fine particles of an oxide of at least one element selected only from the group consisting of Ti, Zr, V, Nb, Cr, Mo, W, Al, Mn, Fe, Co, and Ni, said particles having an average particle size of 5 to 50 nm, and
• (B) a polymer product, which is an organosilicon compound containing a transition metal element having an average molecular weight of from 1,000 to 100,000 measured using gel permeation chromatography using polystyrene standards, said polymer product being obtained by hydrolysis followed by polycondensation of a mixture of an organosilicon compound and a transition metal compound concurrently in an organic solvent containing water in the presence of a catalyst at 40 to 120° C., said organosilicon compound being a trifunctional alkoxysilane represented by the general formula (I):
• RSi(OR′)3 (I)
• wherein R and R′ represent organic groups which may be identical with each other or different from each other.