man it is not the color ..which matters the colour depends on the indicator.. in the pH scale O is very acidic and 14 is very basic.7 is neutral. pH do not depend on colour.absolutely no relation.........eg : neurotic acid with pH zero is plain like water. Here is another attempt to answer your question: http://en.wikipedia.org/wiki/Universal_i...
Acrylic Adhesives. Acrylic adhesives can either be water-based (this is also referred to as emulsion or dispersion) or solvent-based. Water-based are slower drying compared to solvent-based systems but generally solvent-based acrylic systems have better resistance to other solvents, chemicals and water.
PVA Glues. Plain old white glue. PVA (Polyvinyl acetates) are probably the most common adhesive on the market. They come in a variety of formulas, all ever so slightly different, and specific to what they are designed to glue. Here are some tips for using Polyvinyl acetates.1  All PVAs are designed to work on porous materials only. PVAs are water based, and clean up with warm soapy water. 2  PVA is only toxic to ingest, it does not emit any harmful fumes, and is not hazardous to touch. 3  PVA sets best in good air circulation, at room temperature. 4  PVAs need pressure to adhere, see our info on clamping.