Howzit Bigs.

The problem with that logic, is the confusion of denatured Ethanol with Isopropyl alcohol.
One of the few thing Oldmac ever got wrong.

Denatured Ethanol does indeed contain those denaturants and should never be used for tinctures, or extractions.
Un-denatured, ethanol, (Grain alcohol), is very expensive and I found it to be less efficient than I. A..


Isopropyl alcohol does not need, and does not contain, any denaturant
It is not necessary.

The skinny:
"
PHARMACOLOGY AND TOXICOLOGY
Isopropyl alcohol is a sedative-hypnotic agent whose toxicity closely resembles that of ethanol, with which it shares strong structural similarity. Like ethanol, isopropyl alcohol's precise mechanism of action in the central nervous system (CNS) remains uncertain. Changes in membrane fluidity and/or function, and interactions with neurotransmitter receptors, are believed to account for the CNS effects of alcohols and other simple hydrocarbons. There is a linear relationship between the molecular weight of alcohols and their sedative effects: as size increases so does sedation. Thus, isopropyl alcohol is marginally more potent than ethanol at comparable concentrations.

Fatality from isolated isopropyl alcohol toxicity is rare, but can result from injury due to inebriant effects, such as untreated coma with airway compromise, or rarely, cardiovascular depression and shock following massive ingestion. Supportive care can avert most morbidity and mortality. It is important to differentiate isopropyl alcohol poisoning from methanol and ethylene glycol, which are more dangerous. Isopropyl alcohol does NOT cause an elevated anion gap acidosis, retinal toxicity (as does methanol), or renal failure (as does ethylene glycol).

In untreated animals, the median lethal dose lies between 4 and 8 g/kg. Many sources estimate the lethal dose to be 250 mL in humans (eg, less than 400 mL of a 70 percent solution). It is important to recognize that, with treatment, adults and children have survived much larger ingestions.
"


Isopropyl will cause serious gastric disturbance if ingested.
(They still get idiots in the E. R. that try it.)
However, it does evaporate completely, leaves no residue, and is quite safe for oil extraction.

Last time O.M logged in to a sister board was 10/25/11. He left no message.
Old fart's got me worried.

Aloha,
Weeze