Another recessive: apricot at
The colour is described as a darker or more orange yellow, phenotype is distinguished from yellows by the presence of pink blush in the interior locular walls near the placenta, and by small islands of sharply defined red tissue.
The gene is not allelic to r, t, or B.
The original apricot fruit pheno (which I think is from RRatat) sounds distinctive enough, but combinations of the recessives rr atat and tt , are reported to be difficult or impossible to distingush by visual characteristics.
http://www.genetics.org/content/40/5/715.full.pdf
http://tgrc.ucdavis.edu/Data/Acc/GenDetail.aspx?Gene=at
The flower phenotype is distinctive - nearly white pale petals - if this can be expected in every plant with atat, it would make it easy to tell.