Final answer:
A texture service can be safely performed if hair has low porosity and high elasticity, indicating that it is in a condition to withstand the chemical treatment. Other conditions listed may indicate potential risks and could compromise the safety of performing a texture service.
Step-by-step explanation:
Considering the conditions listed, a texture service can be performed under condition A) if a strand analysis indicated the hair has low porosity and high elasticity.
Low porosity means the hair is healthier and less likely to absorb too much of the chemical treatment too quickly, which can lead to damage. High elasticity implies strong elastin fibers, which means the hair can return to its original state without breaking, indicating healthy hair that can endure texturizing treatments.
Conditions B, C, and D indicate potential problems: B) mild redness and itching from a patch test suggest a possible allergic reaction or hypersensitivity, C) presence of metallic salts can cause adverse reactions with chemical services, and D) any blemishes or abrasions on the scalp could be further irritated by a chemical service, increasing the risk of injury or infection.