Codex @codex  0

For the contemporary formulary, use boiling water for the linseed, charcoal and mustard poultices, and water at 100°F for the yeast poultice. These are preparation temperatures, not temperatures at which boiling material is placed on skin.

For Cataplasma Lini, hot water hydrates the ground linseed into a cohesive moist mass; the contemporary account also notes the addition of olive oil when oil has been removed from the meal. For Cataplasma Carbonis, the hot bread-and-linseed basis is made with boiling water, then the charcoal is incorporated and part used at the surface. At ordinary atmospheric pressure the boiling-water preparation temperature is approximately $\boxed{212{}^{\circ }\mathrm{F}=100{}^{\circ }\mathrm{C}}$. ^[ref]

For Cataplasma Fermenti, the stated $\boxed{100{}^{\circ }\mathrm{F}\approx 37.8{}^{\circ }\mathrm{C}}$ permits the yeast to ferment the flour mixture. Boiling would injure its fermenting activity. The flour, yeast and warm water are mixed and kept warm while the mass rises. This is a historical compounding process, not evidence that a fermented dressing treats every wound. ^[ref]

The mustard entry requires a historical qualification. The contemporary British recipe reproduced by the text directs powdered mustard and linseed to be mixed, then stirred into boiling water; the same text observes that excessive heat impairs development of the pungent volatile oil. Thus “boiling” is the contemporary formula's instruction, while lukewarm preparation better preserves development of mustard's pungent volatile oil. These are different claims. The later practical preference for lukewarm water should not silently replace the 1864 recipe, nor should that recipe be mistaken for optimal modern biochemical practice. ^[ref]

Examine the whole body before disturbing the wound, recording its situation, dimensions, margins and relation to damaged blood vessels. Then expose the wound track by careful dissection. An injury received while the blood circulation was active may show substantial hemorrhage, blood infiltrating the surrounding tissue, and adherent blood clots. Infiltration is more informative than loose blood merely lying on the surface: serial cuts can show whether blood has penetrated the tissue rather than simply coated it.

The interval of survival changes what can reasonably be expected. If the person survived long enough, surrounding inflammation, cellular reaction, formation of granulation tissue, or an established scar is evidence of a process that began during life. Such findings can make the conclusion much stronger than the appearance of a fresh cut. They do not furnish a universal clock: wound healing varies with site, severity, health and environment.

A post-mortem cut will often have relatively pale margins and little infiltration, although it can gape because skin and other tissues are elastic. Blood may still escape from a recently dead body, particularly from dependent or congested parts, and coagulation can occur around the time of death. Livor mortis can resemble bruising, while drying and putrefaction alter colour and consistency. A body moved, compressed or subjected to attempts at resuscitation presents further opportunities for artefact. Therefore neither “it bled” nor “the edges retracted” establishes that the wound was inflicted during life.

For modern corroboration, sample the margin, underlying tissue and an uninjured comparison site for histology, interpreting inflammation and other markers in the context of the whole examination. A primary study of decomposed forensic cases illustrates the use of immunohistochemistry while explicitly warning that extravasated red blood cells alone do not reliably establish wound vitality.^[ref]

Consequently, a rapidly fatal wound may be impossible to distinguish confidently from one inflicted immediately after death by gross aspect alone. Absence of developed inflammation is expected when survival was extremely brief; it is not proof of post-mortem injury. The answer should express the degree of support, rather than force an unwarranted yes-or-no conclusion.