Ah!
There is actually more than one. BUT, The one I am going to remark on today is U.S. Navy "Sea Blue on Hulls and vertical Surfaces!". Slide over to your bottle, of Modelmaster Sea Blue! This is for all intents and purposes the nastiest color to get right in scale. First and Foremost, if the ship is painted that way(The model that is) When it gets dark you can't see it anyway! I learned this for sure. Good old ModelMaster had it right for just built!
After that, all bets are off. Even the more well known brands of Acrylic have gotten this wrong! You cannot paint right out of the jar or Bottle for 1/350 or 1/700. Or any ship slightly larger and definitely not smaller!! You may have seen my Post about the U.S.S. England in 1/350. Yup! I made that mistake. All the hard work with the P.E. and detail and it all disappeared under that coat of Blue! Unless I hit it with one of those neat little LED flashlights, you can't even see the W/T doors on the Bulkheads, much less the Floater Net Baskets!
So here's what I did for the Arizona in 1/200. I decanted half the bottle of Modelmaster "Sea Blue. Then added 1/4 bottle of white. I added then, about four drops of the Blue back. Mixed well and thought "Close but no Cigar!" I then added four more drops of the Blue and four drops of ModelMaster Light Gull Grey! Bingo! It made the "Sea Blue look lighter and slightly weathered. Then with the slight weathering at the W/L and from sea water running off the deck and out of the scuppers she looked right.
So, Remember, never trust the paint right out of the bottle. It looks right through the glass or plastic but it ain't! It is actually more intense than you thought it would be. Why? Well, think about it a minute. When you paint this color and take a photo of the model with a flash, what's going to happen! The Flash is bright enough it will reflect back off the PIGMENT that makes up the color. That's right folks. The Pigment is what makes or Breaks a model Painted with any product in any color. This is because the paint is made up of natural or artifical Pigments and a clear gloss or flat Base.These also affect the color. Some bases ( Or Vehicle, in the trade) will Yellow it or Grey it. You won't know this till you're finished with your masterpiece!
This then is the reason for this post. Check Constantly with Scrap, wether you Brush or Spray. The color also is affected by the Primer you used. How many times have you read articles about that! White primer. Brighter color, no matter what shade or pigmentation .Grey primer, Darker color, same pigmentation! This is why Photographers also use a thing they assign to paint and other media and it's called Temperature. Yup, it's actually called that. A paint can actually be "Hot" under lights and Flash or just plain "Cold"! How many buildings have you been in that you feel fidgety in? How many give you a calm feeling?
See, that is part of it. The temperature of the Paint is what you are reacting to. Your eyes see, say Light Green. The Cones and Rods in your eyes say Light Green/ Turquoise! It's that difficult to nail it. In a model it will always be more intense, remember that!