What's the difference between opaque and pyrophane?

Opaque

Definition:

(a.) Impervious to the rays of light; not transparent; as, an opaque substance.
(a.) Obscure; not clear; unintelligible.
(n.) That which is opaque; opacity.

Example Sentences:

(1) "Maybe dullness is associated with psychic pain," Wallace wrote at one point, "because something that's dull or opaque fails to provide enough stimulation to distract people from some other, deeper type of pain that is always there, if only in an ambient low-level way, and which most of us spend nearly all our time and energy trying to distract ourselves from."
(2) It should also be realised that, in a very few hospitals, swabs which do not have an opaque marker may occasionally be used in theatre.
(3) The colors of mixtures of dental opaque porcelains and modifiers were measured with use of the CIE L*a*b* uniform color space.
(4) Type II pigment is extremely electron-opaque after staining with heavy metals to the extent that they appear practically amorphous.
(5) In conclusion, the use of metoclopramide in the postoperative period did not result in a quicker return of propulsive motility in the right or left colon as judged by the radio-opaque markers and serial abdominal radiographs.
(6) At the former site the membrane overlying the bud showed an electron opaque thickening which imparted to the mature particle an asymmetrical appearance.
(7) At that time, the universe underwent a crucial change: it went from being opaque to transparent.
(8) Our data confirm the poorer short-term orientation performance of jaundiced infants treated with phototherapy but do not indicate that covering the eyes with an opaque screen improves behavioral organization.
(9) All patients had at least one laparotomy, at which time a biopsy was obtained, radio-opaque clips were placed to define the extent of the gross tumor, and usually some form of bypass procedure was performed.
(10) Two types are present, a crystalline (clear) form and a white, opaque form with pigmentation resulting from a diene rubber.
(11) In two of these cases, pathologic findings included opaque ciliary body cysts, a ciliochoroidal effusion, retinal microaneurysms and hemorrhages, and detachment of both the sensory retina and the retinal pigment epithelium.
(12) The WF-1 are originally arranged around the WF-2, as small electron opaque granules making a dark ring, to move towards the periphery of the macrogamete body with maturation.
(13) Five fish with lateral lines cut at the opercula were unable to school when wearing opaque eye covers.
(14) A combined morphological, autoradiographic, and cytochemical study at the electron microscope level has been directed towards the formation of electron-opaque granules of cultured macrophages.
(15) The intranuclear spindle of yeast has an electron-opaque body at each pole.
(16) On lecithin agar, interpretation was easier, phospholipase A was detectable, and opaque zones were visible 1 or 2 days earlier than on egg yolk agar.
(17) New light-curable adhesive opaque resins were prepared using 4-methacryloxyethyl trimellitate anhydride (4-META), triethylene glycol dimethacrylate (TEGDMA), di (methacryloxyethyl) trimethylhexamethylene diurethane (UDMA) and titanium dioxide.
(18) In particular, most prototrophic strains obtained from patients with localized infection had proteins I with molecular weights varying from 35,000 to 38,000 daltons and gave predominantly opaque colonies.
(19) Resulting specimens yield an excellent view of the skeletal system and the injected vascular system without obstruction by opaque tissues or disruption by physical removal of connective tissue.
(20) Follicles greater than or equal to 5 mm in diameter were classified as clear (n=68) or opaque (n=72) based on their surface appearance.