A graph is said to be vertex k - colored if it admits a vertex k -
coloring. The minimum value of k for which G is vertex k - colored is called vertex chromatic number of G and is denoted by [[chi].sub.V] (G).
Total coloring of a fuzzy graph
Tinting strength and hiding power of the pure types are double those of lithopone types and recommended for
coloring film and sheet when minimum pigment content and maximum opacity are needed.
Colorants
Black hair and a huge variety of reds, light and dark browns and blondes can all benefit from henna's
coloring and super conditioning properties.
Hair to dye for: natural alternatives to toxic coloring agents. (Consumer News)
"The
coloring has a lot to do with how the wood is ground," says Brian Shea, whose company makes mulch colorants as well as the Mulch Color Jet application system.
A colorful market: colored wood mulch is providing a sustained market for many wood recyclers. (C&D Series)
Furthermore, past studies often focused on a small number of participants and thus lacked the statistical muscle to pick up an association between hair
coloring products and malignant tumors in a specific subgroup.
Mixed news on hair dyes and cancer risk
"Now our goal is to industrialize color infusion," says Witman, noting that a 54-liter hot bath has already been designed by Hennecke to permit the
coloring of larger parts.
Color-infusion process is suited to short runs of different hues. (Close-Up)
Producing solid features in an otherwise hollow rotomolded part and
coloring parts in easier and more flexible ways are two new developments highlighted at the January meeting of the Association of Rotational Molders (ARM) in Minneapolis.
New machinery & materials help rotomolders add value to parts. (Rotomolding Close-Up)
Color pigments include Meteor and Meteor Plus complex inorganic pigments for applications requiring heat resistance and exterior durability; Engeltone organic pigments in a wide spectrum of colors; Engeltone low-soluble cadmium pigments for uses requiring good heat and light stability; and Engeltone lead chromate and moly orange pigments for cost-effective
coloring.
COLORANTS
Pigment paste concentrates are high-solids dispersions in a reactive vehicle for
coloring unsaturated polyester, epoxy, and PUR Offer high heat and light stability and consistent concentration, color, and grind for easy batch-to-batch color matches.
Colorants
Color pigments include Harshaw Meteor and Meteor Plus complex inorganic pigments for applications requiring heat resistance and exterior durability; Harshaw organic pigments in a wide spectrum of colors; Harshaw low-soluble cadmium pigments for uses requiring good heat and light stability; Harshaw lead chromate and moly orange pigments for cost-effective
coloring; and standard and solvent-free dispersions, which include Harshaw, Aurasperse, Aquerus, and Gallery One.
Colorants
From a
coloring point of view, the rotomolding process isn't very forgiving, unlike injection molding or extrusion, where residence times are relatively short and the process can impart a moderate degree of mixing action.
You can get consistent color in rotomolding
New
coloring options shine among additives exhibits at the show.
Chemicals & additives
Geode line of complex inorganic pigments (heat-stable, light-stable, weatherable, and chemically resistant) is suitable for
coloring most thermoplastics and thermosets, and recommended for engineering resins and rigid PVC.
Colorants
Based on company's studies, dyes are also suitable for
coloring the nonpolar plastics (PE and PP) in the presence of specialized carriers.
Colorants: product lines reviewed
New from Engelhard are non-metal-based pigments (naphthol red 2, 17, 22, 23) for printing on plastic packaging as well as
coloring the packaging resin itself.
Colorants: heavy metals get the boot