Local gin (50% ethanol/water)) extracted 8.5% of orange-reddish dye from the seed of Sterculia tragacantha while methanol extracted I2..1% wine red dye from the rhizome of Zingiber officinale. The IR and the UV absorption characteristics and the results of the chemical analysis indicated that these dyes are of hydroxyanthraquinone class. The dye extract from Sterculia tragacantha gave persistent orange colour to white synthetic fabric (Satin) but stained while paper pink while extract from Zingiber officinale dyed natural while cotton fabric. paper and satin fabric bright yellow. The colours were fast to water, washing detergent solutions and to dayiight. The dye from Zillgjber officinale was also found suitable as colour indicator in pH titration of a strong acid against a strong, base, therefore serving as a substitute for the methyl orange standard indicator in volumetric analysis.
Recommendation for adoption in practical Chemistry exercises in Secondary Schools is made.


Akpabio, U. D. and Inyang, N. E. U. (1998): “Local Plant Dyes and their Application in Titration Dyeing of Fabrics and Paper”. Nigerian Journal of Science and Science Education. 5(1), July, pp. 25-33

Prof. Nsedu Inyang

Professor N.E.U. Inyang has always been a teacher. He started as an Assistant Science Master at Duke Town Secondary School, Calabar. From 1976 till date he has taught in various institutions. He was appointed Acting Head, Department of Science Education in Uniuyo from 1994-1998 and promoted Associate and full Professor of Science Education in 1999 and 2002 respectively. He has taught undergraduate courses in Science Education, supervised undergraduate projects and jointly supervised Masters and Ph.D dissertations and theses both in University of Uyo and during his sabbatical leave to Nnamdi Azikiwe University, Awka.

Prof. Nsedu Inyang served in various capacities in the Science Teachers‘ Association of Nigeria (STAN) at both State and National levels. It was during his tenure as Chairman of Akwa Ibom State branch of STAN, He that Akwa Ibom State Branch was adjudged the best branch of the year for an outstanding membership among other achievements. Prof. Inyang served the Akwa Ibom State Government as a resource person at various workshops for primary and secondary school science and mathematics teachers.

Prof. Nsedu Inyang has been engaged in a number of Editorial services. He jointly published Integrated Science Workshop proceedings on the Integrated Science Curriculum in the 3 3 system Secondary Education in 1981. He jointly edited a book of readings on science and society 1997. He is editorial adviser of the integrated Science Education series of Integrated Science Panel of STAN and an author of the Basic Science of the University Press Plc, Ibadan, Nigeria.

To date, Prof. Nsedu Inyang has 45 publications to his credit made up of 22 journal articles and 23 book chapters, many of which can be accessed on this knowledgebase. He attended and presented several the keynote addresses and lead papers at conferences, some of which includes Teacher’s Day in 2009 at the Akwa Ibom State rally of NUT and a motivational talk at the Mobil/NNPC/Akwa Ibom State Science quiz, facilitated by the Akwa Ibom State Branch of STAN etc.

Prof. Nsedu Inyang has played a number of leadership roles in his christian life. He is happily married and is blessed with successful children.
His personal knowledgebase and website can be accessed via www.nseduinyang.com.ng

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