It is used as a pigment (cadmium yellow), for it retains its colour in an atmosphere containing sulphuretted hydrogen; it melts at a white heat, and on cooling solidifies to a lemon-yellow micaceous mass.
In Caswell county, North Carolina, " lemon yellow " tobacco was first produced in 1852, and the demand for this " bright " variety became so great that except during the interruption of the Civil War its culture spread rapidly.
sulphurea has shining deep green leaves and lemon-yellow flowers, deeper yellow in the centre, and with a pale-violet spur.
It is obtained as fine lemon yellow deliquescent prisms by evaporating a solution of any of the oxides in nitric acid.
The caliche has often a granular structure, and is yellowishwhite, bright lemon-yellow, brownish or violet in colour.