L to R: California CD 121 in peach, CD 161 in peach and CD 161 in a peach (dome)/yellow (skirt) two tone.

It is a well-known bit of information that many California insulators were manufactured in yellow glass. These insulators when exposed to UV radiation that naturally occurs in sunlight changed color to various shades of purple. This was a chemical reaction in the glass caused by the manganese element that was present either in the glass cullet or added by the factory as part of the glass batch materials to clarify the glass color. Manganese was a common material in early 20th century glass making and much of the glass items from that era will turn purple when exposed long enough to sunlight. Note the use of the term sun colored amethyst (SCA). This color change from yellow to purple is not automatic and there are transitional colors before a yellow insulator reaches an end state purple color. First stage is a color change from yellow to peach (see right side insulator in photo), followed by a second stage color change from peach to SCA peach or peachy SCA, whatever you prefer, followed by last stage of color change from SCA peach to some shade of purple.

I find the straight peach color Californias much more difficult to find than the yellows but collectors in general prefer the yellow Cals over the peach Cals despite the difference in rarity. Because of the limited availability of these colors in California glass, many collectors have misidentify the peach color as yellow. Sometimes, the peach Cal, like the middle one in the photo, will have a subtle orange undertone, which gives the peach a richer color. This may sometimes be referred to as "Gold" color by dealers who will charge a premium for it.

I would love to obtain examples of the peach color in the following CD's: 102, 133, 152, 160, 166 and 200.

CD 145 in peach acquired :-) [id=431294156]