The Delplot technique for the classification of experimentally derived reaction products as primary, secondary, tertiary, etc. was extended to address experiments in which reaction products are present in non-zero concentrations in the feed. This allows use of the Delplot method for the complex feedstocks common in energy applications, such as crude oil, where lumped models containing boiling-point-defined pseudocomponents will frequently have non-zero product amounts in the experimental feedstocks. We found that the existence of the intermediate products in the feed changes the behavior of the Delplots. For example, in the A ->(k1) B ->(k3) C; A ->(k2) D sequence with B-0 not equal 0, the Delplot can suggest B to be primary, secondary, or neither depending upon the ratios k(1)/k(2) and A(0)/B-0. These findings suggest key additional experiments covering different limits to be able to identify the proper classification of the intermediate products in the reaction network.