This page will calculate and display the tints and shades and the 12 colours of a colour wheel starting from your chosen colour. Just enter RGB values of the start colour (between 0 and 255) and press Go.
Irwin Associates get back in touch by return; follow through with information as requested; say they cannot but will investigate when asked for something outside their field; and are as delighted as I, the customer, when a project is satisfactorily completed. They really do have that old-fashioned pride in being of service to their clients in a new-fashioned world of technology - and the value of that alone is beyond price.
Roger Carr