Would appreciate the insight of experienced Kodak DataGuide Users.

I'm have the 1979 Black-and-White Darkroom Dataguide
Edition 6

On Page 5 The Table of Development Numbers.
Why are some numbers Light Grey while others Orange Brown vs normal BLACK?

On Page 7 The Developing Dial
What is the purpose of the Orange Brown "P" to the left of the dial Triangle Pointer?

Thanks in advance

Kanata Ontario Canada Where Spring has just sprung
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