efishnc brings up a great point on making colors along with lines. I have colorants coming out the gazoo and rarely use any "as is" out of the bottle, but then I like creating and avoid the hohum of plain colors. If you get serious about color mixing aircraft, start with toothpicks dipped in your adjustment color instead of relying on drops. Its way more precise to dip a toothpick and stir what's on the end into a color.
This thread got me curious just what I do have for colors and I have just about all of the X2 colors, many, many of the original Caney Creek colors, and 56 - 2 ounce bottles of MF colors. Carole says I have too much color, I say I could use a couple more. lol