There's no such thing as pH paper with a specific color of "orange". pH paper is designed to change color in response to the acidity or alkalinity of a substance, and each manufacturer has its own color chart.

Here's how it works:

* Universal pH paper: This is the most common type, offering a range of colors to indicate different pH levels. Each color corresponds to a specific pH range.

* Specific pH paper: Some pH paper is designed to test for a narrow pH range and will only change color within that range.

To understand the color of your pH paper, you need:

1. The specific pH paper brand and type: This will give you the color chart or instructions.

2. The color the paper turns: This will tell you the pH of the substance you're testing.

If you have a specific brand and color, I can help you identify the pH!