  The 4,n-alkyloxybenzoic acid 6OBAC has a very rich variety of crystalline
structures and two nematic sub-phases, characterised by different textures. It
is a material belonging to a family of liquid crystals formed by hydrogen
bonded molecules, the 4,n-alkyloxybenzoic acids indicates the homologue
number). The homologues with n ranging from 7 to 13 display both smectic C and
N phases. In spite of the absence of a smectic phase, 6OBAC exhibits two
sub-phases with different textures, as it happens in other materials of the
homologue series which possess the smectic phase. This is the first material
that exhibits a texture transition in a nematic phase directly originated from
a crystal phase. Here we present the results of an image processing assisted
optical investigation to characterise the textures and the transitions between
textures. This processing is necessary to discriminate between crystal
modifications and nematic sub-phases.
