However , having to wash off the color from the bubbles rendered them unsuited to a mass - market toy .
In the process of trying to rediscover the recipe , he changed the formula , making the coloring water - soluble .
Having to wash off the color from the bubbles rendered them unsuited to a mass - market toy .
In the process of trying to rediscover the recipe , he changed the formula , making the coloring water - soluble .