>> see below, please <<
This looks like a case in which, if it's at all possible, you should contact the client. Confirming the spelling would be a good start; but more context would be ideal, because the use or application of the oil will probably identify it for you.
The _Diccionario para Ingenieros_ by Louis Robb has "aceite de ricino" = "castor oil" and "rincinus oil." The Simon & Schuster _International Spanish<>English Dictionary_ has no entry for "resino" per se; however, it does give "resina" = "resin" or "rosin" and, on the English > Spanish side, "resinous" = "resinoso/resinosa."
Ricin, meanwhile, is a toxic [red-blood-cell aggregating agent that isolated from the castor bean (Ricinus communis), which is one of the most toxic compounds known. Ricin is used as a tool in studies of cell-surface properties, and to some extent in cancer research.
The _Condensed Chemical Dictionary_ (9th ed., Van Nostrand Reinhold) has this to say: "The term 'resin' is so broadly used as to be almost meaningless; it would be desirable to restrict its application to natural organo-soluble, hydrocarbon-based products derived from trees and shrubs…" This source adds, "Natural resins are vegetable-derived mixtures of acids, oils, and terpenes in the bark of many trees and shrubs…. The best known are rosin and balsam, which are obtained form coniferous trees. Other types include shellac, amber, and ester gum. Liquid resins (sometimes called "resinoids") are represented by linseed and similar drying oils.
Based on this information, it seems likely that Paula K. is right, and that the Spanish phrase should be spelled "aceite de resina" and the English term is "tall oil." However, you can't rule out the possibility that, as Jesus suggests, the Spanish was meant to be "aceite de ricino," in which case the English would be "ricin oil" or "castor oil."
One final English alternative: "rosin oil" (rosinol), which is obtained through the dry distillation of rosin. This "viscid, yellow, fluorescent fluid, which is insoluble in water, dissolves phosphorus, sulfur, and many other organic compounds. It is used in the manufacture of printing inks, and in varnishes, lacquers, and axle greases."
In summary, at the moment there are too many possibilities and too little information…
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