Visible finger-lines are part of a recommended manner, not the independently obligatory threshold. If the necessary upper-surface area is wiped, the absence of distinct streaks does not alone defeat the obligation.
Conversely, attractive streaks that fail to cover the minimum area do not satisfy the quantity requirement.
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Wiping Over Khuffs: Conditions, Duration, Nullifiers, and Splints
Visible finger-lines are part of a recommended manner, not the independently obligatory threshold. If the necessary upper-surface area is wiped, the absence of distinct streaks does not alone defeat the obligation.
Conversely, attractive streaks that fail to cover the minimum area do not satisfy the quantity requirement.