The hybrid between a red finger lime and ever popular Ellendale mandarin was done by CSIRO about 16 years ago. Ellendale is really a tangor like honey murcott but unlike honey murcott appears as a typical mandarin with no obvious orange characteristics. Blood limes vary a bit but are mostly 30 to 35g,egg shaped and have reddish flesh most of the time. I bought some at the supermarket today and there is a raspberry element to the aroma when you scratch the skin. To me they seem close to a finger lime fruit in many respects.