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Showing 1 to 9 of 9 for “"Coloring matter"”.

  1. Coloring matter in camillia japonica flowers

    Stoner, Robert James2018

    <p>The coloring matter in flowers has been used for centuries as a dye. Early man did not know the chemical nature of these coloring matters. Recent investigations have shown that the dark pigments whereas the lighter pigments of flowers are in the anthoxanthin group of pigments. Both of these …

    u-pacific Repository record

  2. An investigation of the coloring matter of sulfite liquor

    Simerl, Linton EarlGeorgia Institute of Technology1939

    gatech Repository record

  3. An experimental investigation of coloring matter in Canna Indica flowers

    Vogt, James Clinton2018

    … for the purpose of isolating and identifying the coloring matter in flowers of the canna indica (canna lily) variety. It was done by extracting the pigment from flower petals with methanol, amyl alcohol, and other solvents, and crystallizing the pigment as a salt. Physical properties such as …

    u-pacific Repository record

  4. An experimental investigation of coloring matter in flowers of vinca major

    Gulbenk, Alin Haykohi2018

    … though early man did not know the nature of coloring matter in flowers, he used the coloring matter as dye for centuries. There are a variety of reasons for the interest of chemists in natural and artificial coloring matters. One of these is the color pleasure, anothe1· is the commercial …

    u-pacific Repository record

  5. Condensation of terephthalaldehyde and hydroxyacetophenones

    Bonelli, Ernest John2018

    <p>Organic pigments were the source of coloring matters used by man until comparatively recent times. It is to be presumed that the first steps in the use of these pigments no dyes resulted from the accidental staining of the skin or fabric by a vegetable material. Prehistoric man, in order to …

    u-pacific Repository record

  6. A study of methods of preparation of phthalaldehyde

    Chambers, Harold Leon2018

    … exist as natural products and occur widely as coloring matter in flowers and plant saps.</p><p>An attempt has been made to work out a new method for the preparation of phthalaldehyde. Two lines of research have been followed, neither of which produced the desired compound.</p><p>The first …

    u-pacific Repository record

  7. Certain coloring matters derived from vanallin and methyl salicylate

    Coe, Thompson James2018

    … of this investigation was to prepare a number of coloring matters by condensing vanillin with para-methoxyacetophenone, meta-nitroacetophenone, and para-bromoacetophenone, and to prepare another group by condensing methyl salicylate with acetophenone, para-methoxyacetophenone, …

    u-pacific Repository record

  8. Chalcones derived from m-nitroacetophenone

    Hendry, Richard Allan2018

    The object of this research was to prepare substituted derivatives of various chalcones having the nitro group substituted in the 3<sup>1</sup>-position, the idea being to help complete the series of chalcones having the nitro group in that position. This was to be done by condensing various …

    u-pacific Repository record

  9. Implementación de los controles operacionales y evaluación de los índices de frecuencia, gravedad y accidentabilidad en una empresa de producción de colorantes naturales, Lima-2018

    Figueroa Bustios, Oscar RobertoUniversidad de Lima2022

    La presente investigación tiene como objetivo principal implementar los controles operacionales y evaluar los índices de frecuencia, gravedad y accidentabilidad en la empresa de producción de colorantes naturales, Lima – 2018. Según la Ley 29783 se realizó un estudio de línea base o diagnóstico del …

    lima Repository record