Sep 26, 2012. /Lesprom Network/. Rengo Co., Ltd. developed and begun selling Shiragiku ZERO, an environmentally friendly chipboard that contains no fluorescent agents, as the company said in the press release received by Lesprom Network. Chipboard is a type of paperboard for which the main raw material is recovered paper. In particular, white-lined chipboard is widely used as a material to make decorative boxes for confectionery and other products. Shiragiku ZERO is an improved version of ‘Shiragiku S, the white-lined chipboard that Rengo has sold in the past. Rengo has reviewed and carefully selected the materials used for the back layer and changed the proportion ratio to create this product. Compared to the original product, brightness and strength have been significantly increased. In particular, this safe and reliable product contains no fluorescent dyes (fluorescent brightening agents), which are a type of hormone-disrupting chemical that is thought to be carcinogenic. In addition, Shiragiku ZERO – which has improved brightness compared to the original product – further increases the marketability of products by way of contrast with the board’s white surface. In this way, it is expected to improve promotional power when selling products.