silkworm-egg paper
Specialized term in sericulture: paper sheets on which silkworm moths lay eggs, used for distributing and hatching silkworms.
Sericulture farmers purchase silkworm-egg paper to start raising silkworms.
Compound of 蚕 (san, 'silkworm'), 卵 (ran, 'egg'), and 紙 (shi, 'paper'). The reading is on'yomi throughout.