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We present the results of two-band CCD photometric monitoring of thegravitationally lensed quasar Q 0142-100 (UM 673).The data, obtained at ESO-LaSilla with the 1.54 m Danish telescope in the Gunn i-band (October 1998 -September 1999) and in the Johnson V-band (October 1998 to December 2001), wereanalyzed using three different photometric methods. The light-curves obtainedwith all methods show variations, with a peak-to-peak amplitude of 0.14magnitude in $V$. Although it was not possible to measure the time delaybetween the two lensed QSO images, the brighter component displays possibleevidence for microlensing: it becomes bluer as it gets brighter, as expectedunder the assumption of differential magnification of a quasar accretion diskComment: Accepted for publication in Astronomy & Astrophysics; 8 pages, 7  figure

Photometric monitoring of the doubly imaged quasar UM 673: possible evidence for chromatic microlensing