Auto manufacturers use two-letter codes as a shorthand to identify a particular paint color offered with a car's year and model. The code itself does not have any meaning.
Example
Many 2007 Ford mid-size sedans were offered with the paint color "Creme Brulee," which was referenced as "PH." Thus, to obtain a matching paint, you should reference "Ford 2007 PH."
House Paints
House paint colors are similarly coded, but since a given color may be in stock for many years, and homeowners want many more different shades than car buyers, a two-letter code is not enough to identify a particular shade or hue.
House Paint Coding
You will generally see a descriptive color name along with a code, such as "Autumn Gold P23" or "Sky Blue HY450". The letter-number codes are important for obtaining an exact match, as the paint manufacturer may have put out several versions of "Autumn Gold" or "Sky Blue".
Another Possible Use of "pH"
The chemical term "pH" refers to the relative acidity or alkalinity of a substance. The pH of a paint may be important if it is a paint meant to cover metal. Water, being "neutral," has a pH of 7; the lower the pH, the more acidic is a substance.
Preparation: Effects on pH
The pH of the final mixture of thinner and paint should be taken into account when preparing to paint metal surfaces. Paint manufacturers have explicit, detailed instructions on prepare metal surfaces for painting.
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