Hey SYG,
65Pontiac hit the nail on the head! Spike it works the best. You have to be careful when buying though, there is also plastic coloring
that doesn't penetrate and will come off when wet. Also not all plastics will accept the dye. Have fun! We have been using the color that you're looking for , for several years. We even named it. Sometimes deadly and sometimes they won't even look at it.
Let me know how it works out for you.