
1) Antiknocks 2) Coloring agents 3) Food coloring and such
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https://www.crosswordclues.com/clue/additives

Additives are materials that are added to a polymer to produce a desired change in material properties or characteristics. A wide variety of additives are currently used in thermoplastics, to expand or extend material properties, enhance processability, modify aesthetics, or increase environmental resistance. Additives enhance properties like flame...
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http://www.blowmachines.com/glossary1.htm

In the manufacturing process of plastics, polymer is just one constituent. Their are other chemicals like impact modifiers, colorants, reinforcements, plasticisers and stabilizers etc that give specific properties to the plastics. These are called additiv
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http://www.chemicalglossary.net/definition/141-Additives

Ingredients of paper other than pulp. Additives include clay fillers, dyes, sizing, and other chemicals.
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http://www.encyclo.co.uk/local/20829

In the context of polymers, substances added to modify properties, for example making it more flexible, or more stable See also plasticiser, stabiliser
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http://www.encyclo.co.uk/visitor-contributions.php

chemical compounds used to alter characteristics of lubricating oils and fuels.
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http://www.horizonsunlimited.com/gear-up/motorcycle-terms-and-glossary

Ingredients mixed into resin to improve properties.
Found on
http://www.komprex.com/Glossary/index.htm

the term used for a large number of specialist chemicals which are added to resins/compounds to impart specific properties, for example, flame retardancy, and UV resistance
Found on
https://compositesuk.co.uk/composite-materials/glossary-terms

a diverse group of specialty chemicals incorporated into plastic formulations before or during processing, or to the surface of finished products after processing. their primary purpose is to modify the behavior of plastic during processing or to impart useful properties to fabricate plastic articles.
Found on
https://www.usplastic.com/knowledgebase/article.aspx?contentkey=784
No exact match found.