Secure article comprising a revelation screen and a combined image, or assembly comprising a secure article and another object, the secure article comprising one of the revelation screen and the combined image and the object comprising or forming the other of the revelation screen and the combined image, the combined image being composed of a plurality of interleaved images (I 1 to I n), the combined image comprising a periodic alternation in a first direction (X; X I, Y I), of interleaved image elements (i 1 to i n; p 1 to p n), the elements (i 1 to i n; p 1 to p n) belonging to one and the same interleaved image (I 1 to I n) being of the same colour and the elements (i 1 to i n; p 1 to p n) belonging to different interleaved images (I 1 to I n) being of different colours, the colorimetric difference ΔE*94 according to IEC 1994 of the interleaved image elements (i 1 to i n; p 1 to p n), belonging to different interleaved images (I 1 to I n), being greater than or equal to 2, the revelation screen comprising a periodic alternation in a second direction (X; X T, Y T) of an occulting screen element with a non-occulting screen element, the dimension in the second direction (X; X T, Y T) of the non-occulting screen elements being greater than the dimension in the first direction (X; X I, Y I) of at least one interleaved image element (i 1 to i n; p 1 to p n), the period of the revelation screen in the second direction (X; X T, Y T) being equal to the period of the combined image in the first direction (X; X I, Y I), the revelation screen making it possible, when it is overlaid on the combined image, the first direction and the second direction being aligned, to observe revealed images (I r; I r1 to I rg; I r1a to I rga, I r1b to I rub) of different colours by displacement of the revelation screen with respect to the combined image and/or by changing the angle of observation, the revealed images being formed by the interleaved image elements being superimposed with the non-occulting screen elements, the revealed images (I r; I r1 to I rg; I r1a to I rga, I r1b to I rub) each appearing, to the naked eye at a normal observation distance, to have a solid colour, the colour of each revealed image being defined by the proportions of each interleaved image being superimposed on the non-occulting screen elements. the combined image being composed of a plurality of interleaved images (I 1 to I n), the combined image comprising a periodic alternation in a first direction (X; X I, Y I), of interleaved image elements (i 1 to i n; p 1 to p n), the elements (i 1 to i n; p 1 to p n) belonging to one and the same interleaved image (I 1 to I n) being of the same colour and the elements (i 1 to i n; p 1 to p n) belonging to different interleaved images (I 1 to I n) being of different colours, the colorimetric difference ΔE*94 according to IEC 1994 of the interleaved image elements (i 1 to i n; p 1 to p n), belonging to different interleaved images (I 1 to I n), being greater than or equal to 2, the revelation screen comprising a periodic alternation in a second direction (X; X T, Y T) of an occulting screen element with a non-occulting screen element, the dimension in the second direction (X; X T, Y T) of the non-occulting screen elements being greater than the dimension in the first direction (X; X I, Y I) of at least one interleaved image element (i 1 to i n; p 1 to p n), the period of the revelation screen in the second direction (X; X T, Y T) being equal to the period of the combined image in the first direction (X; X I, Y I), the revelation screen making it possible, when it is overlaid on the combined image, the first direction and the second direction being aligned, to observe revealed images (I r; I r1 to I rg; I r1a to I rga, I r1b to I rub) of different colours by displacement of the revelation screen with respect to the combined image and/or by changing the angle of observation, the revealed images being formed by the interleaved image elements being superimposed with the non-occulting screen elements, the revealed images (I r; I r1 to I rg; I r1a to I rga, I r1b to I rub) each appearing, to the naked eye at a normal observation distance, to have a solid colour, the colour of each revealed image being defined by the proportions of each interleaved image being superimposed on the non-occulting screen elements.