Ancema blanka, the silver royal,[2][3] is a species of lycaenid or blue butterfly found in the Indomalayan realm.

Upperside, forewing with the costa at the base very narrowly, the apex very widely, the outer margin decreasingly black; the rest of the wing rather light clear blue.

Hindwing with the costa broadly fuscous; the apex widely, the outer margin narrowly black; the abdominal margin as far as the submedian nervure whitish the rest of the wing blue; the anal lobe small, black, crowned with a few blue scales, the lobe anteriorly bearing against it a white fascia the tails rather short, black, tipped with white, the longer one from the termination of the first median nervule, the shorter from the submedian nervure.

Hindwing drab; with an irregular outer discal dark line outwardly defined by white from the abdominal margin to the third median nervule; a small oval black spot on the margin in the first median inter-space; a slightly larger black spot on the anal lobe, anteriorly and posteriorly bearing some fine turquoise-blue scales; the space between and above these spots ochreous; an anteciliary black thread inwardly defined by a narrow white thread from the anal lobe to the third median nervule; cilia of the forewing and the anterior moiety of the hindwing drab, the posterior moiety whitish.

During summers, the male occasionally comes to water but usually keeps to the treetops and rocks, especially on the summit of hills, where they basks in the sun with the wings half open.