NS concat formula with colour

replace(    ns_concat(        ‘<font color=”darkgreen”>’ || {billingtransaction} || ‘</font>’ ||         ‘ –>’ ||         ‘[ <font color=”red”>’ || ABS({billingtransaction.quantity}) || ‘</font> ]’ ||         ‘–>’ ||         ‘<font color=”blue”>’ || {billingtransaction.line} || ‘</font>’    ),     ‘,’,     ‘<br>’ )