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Você já viu alguém testar a “oleosidade” de uma base no papel manteiga? O teste parece convincente: coloca a base no papel, espera alguns minutos e, quando aparece aquela área mais translúcida ao redor, vem a conclusão de que “a base liberou óleo”. Mas não é assim que funciona. Uma base é uma formulação complexa, que pode conter água, silicones, ésteres, emolientes, solventes, umectantes, formadores de filme e outros ingredientes. A interação desses componentes com o papel pode produzir justam...
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