Safranine


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safranine

[′saf·rə‚nēn]
(organic chemistry)
Any of a group of phenazine-based dyes; some are used as biological stains.

Safranine

 

any of a class of azine dyes. The simplest safra-nine is phenosafranine, with the structural formula

where R1 = NH2 and R2 = R3 = R4 = H. Phenosafranine is a red dye formed in small quantities upon the oxidation of a mixture of aniline and p-phenylenediamine. It has very few uses.

Tolusafranine, referred to commercially as safranine (R1 = NH2; R2 = R4 = CH3; R3 = H), is a bright red basic dye. It is formed upon the oxidation of a mixture of aniline, o-toluidine, and p-tolylenediamine. Tolusafranine was used until the 1940’s as a dye for leather, paper, and textiles. Today, it has been almost completely replaced by dyes that are less expensive and more colorfast.

Pinakryptol (R1 = R2 = R4 = H; R3 = NH2) is a green dye obtained by the action on o-aminodiphenylamine of, first, picryl chloride and second, zinc with hydrochloric acid. It is used as a desensitizer in photography for lowering the sensitivity of photographic plates. All safranines are toxic.

M. A. CHEKALIN

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It's time to go back to work, to drive Safranine back up the motorway with pounds 419 to show for the afternoon's efforts and a busy day ahead tomorrow.
For light microscopy, the pollen grains were mounted in glycerine jelly stained with 1% safranine, on a glass slide.
Blackheath, Madrasee, Safranine and Tuscan Flyer come here having captured their latest races, while Texas Gold can probably be counted unlucky not to fit into that category after finishing second at Kempton on his most recent run.
The six-furlong handicap went to the 33-1 chance Safranine, trained by Ann Stokell and ridden by Pat Mathers.
Ann Stokell made it a happy return to the course when saddling Safranine to land the sprint handicap under a positive ride from Dominic Fox.
Safranine won despite losing her near-side cheekpiece after half a furlong.
five-year-old, trained by Bob Cowell, bounded home a length and a half clear of Safranine, with My American Beauty just a short head back in third.
KEVIN DARLEY escaped serious injury after Safranine reared up and unseated him in the paddock before the five-furlong handicap, writes Colin Russell.
Safranine, well-backed but slightly disappointing at Thirsk last week, is one to consider in the `Doug Moscrop 40 Years In Racing' Handicap (3.
45), in which Safranine ought to go off at attractive odds.
CARL LOWTHER, who is back in the saddle after a six-month break "to sort a few things out", was back among the winners when getting the Ann Stokell-trained Safranine home in front in the five-furlong fillies' handicap.
More dangerous is Safranine, who was rated in the 90s in her younger days but has been very disappointing since on turf and