In a prior post, I discussed issues with over coloring melt and pour soaps. This follow-up post shows the results of how the same pigment can give different color shades. GPE's Neon Bright Purple was used in this scenario.
The ice cream soap on the left was colored using white soap base. As you can see, the soap isn't even close to purple color. The opacity of the white soap base causes the purple pigment to soften to a pinkish, magenta color.
The center soap is closer to a lavender color. I used the Neon Bright Purple, but added a very small amount of Neon Bright Blue which yielded a soft lavender in white MP soap base.
Pictured right is clear soap with Neon Bright Purple colorant added. It's definitely not a true purple, but more of a mulberry color. To achieve a "true" purple color in clear MP base, you need to add a small amount of Neon Bright Blue.
If you take a close look at the far right soap, you will note that some of the white dots around the inside edge of the mold have faded away. This happened because the second soap layer was poured at too high of a temperature. It melted portions of the white dots causing them to migrate slightly into the purple/mulberry color.
My final test results showed that the Neon Bright Purple did not migrate or have bleeding issues when used relative portions. Adding extra color to deepen color intensity is going to create over-coloring issues. The soap pictured above sat for several days with no signs of color migration.
If you compare the two ice cream soaps, you will note that the second one is WAY over-colored. The Neon Bright Purple should resemble the lighter shade ice cream soap when used in white (opaque) soap base. If you want a "true" purple, use clear soap with equal parts of Neon Purple and Neon Blue colorant.
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