In fact, you can use various colors of barcode to match your cheerful designs of seals, packages, etc.
In image , colors of red/orange/yellow hats are completely reflected under the red light. In , they are turned white.
On the other side, purple and green hats seem black because the light is absorbed.
When the barcode scanner reads the bars with its red beam, everything turns into monochrome like that.
That's why, the basic color (usually in white) can be any other colors that reflect red light (eg. red, yellow); the bar color (usually black) can be anything that absorb the red.
Please profit by this principle for your cheerful design.
Please download Barcode Color Finder from below and open it by Adobe Illustrator (Version 5.5 or later.)
You can consult a color sample card (of DIC, TOYO, etc.) which describes YMCK ratio of colors.
(2) Drop this color into the Red Filter.
(3) Mix this color and the Red Filter by the operation below:
(4) Drag this color and compare it with the vertical color scale on the left side.
The reflection densities in this scale are made at A/0.0, B/0.1, C/0.2, D/0.3, E/0.56, F/0.82, G/1.08, H/1.34, I/1.6 respectively.
When you drag the color onto the scale, you'll find a color which looks almost same density as your color. That shows the reflection density of your color.
(5) How to judge usability of color
* You cannot use gold, silver or pearl for base nor the bars.