The fabric passes:
on top of a roller (see figure A, point 1);
on the inclined plane, equipped in the center with a frosted glass window (fig. A, 2) under which
a light source favors the control in transparency;
another light source (fig. A, 3) is present at the top of the front of the machine.
The drive and control devices:
on the right side there are switches and speed variators;
on the inclined plane there is a meter-counter device (fig. A, 4);
the advancement of the fabric is regulated by a pedal control (fig. A, 5).
The checked piece is again folded (fig. A, 6), rolled up (fig. A, 7) or placed on a trestle.

Types of checks to be carried out on the dyed patches:
sample color control;
control of color uniformity
a) between the center of the piece and the selvedge,
b) between the beginning and the end of the piece;
control of the uniformity of the color with particular attention to streaks or beatings;
presence of stains (of color, of grease, of acid residues, of foreign substances, etc.);
presence of points not covered;
crow's feet (for synthetic fabrics);
level of color equalization in relation to the various qualitative components of the fabric
(melangiatura);
defects (dead folds, beatings, etc.) deriving from incorrectly carried out loading;
halos due to concentrations of coloring matter.