Systems, methods, and computer program products are disclosed for establishing and using credit limits between counterparties and for managing risk in the trading of financial interests. The agent contains, in a cosmetic carrier, at least one oxidation dye precursor and at least one cationic acylpyridinium derivative. A fluid diverter in the tool diverts all or part of the clean drilling fluid through a port to clear a portion of a borehole wall. The nucleotide and amino acid sequences of VHTAG VH, CC46 VH, CC49VH, CC83 VH, and CC92 VH, and CC49VL, CC83 VL, and CC92 VL idiotype sequences are disclosed, as well as in vivo methods of treatment and diagnostic assay using these chimeric antibodies. The exhaust valve is opened as the pistons contract.