Do silicone toys really react with each other?

High-quality, 100% silicone toys usually sit side by side without problems, but lower-quality blends and soft porous materials like TPE or jelly can turn sticky, cloudy or misshapen where they touch. Since it's hard to know exactly what's in every toy, the easiest rule is to give each one its own pouch and always store TPE and jelly toys completely separately.