We are currently sourcing an Optical Brightener (preferably OB or OB 1) that meets the following technical specifications:

Parameter	Required Specification
Appearance	Light yellowish green powder
Melting Point	199–202 °C
Purity (HPLC)	≥ 99%
Color Shade	Bright blue
Fineness	≥ 300 mesh (Pass 400 mesh preferred)
Ash Content	≤ 0.3%
Volatile Content	≤ 0.5%
Water Content	≤ 0.5%
Transmittance	≥ 92% at 450 nm, ≥ 95% at 500 nm

We kindly request you to confirm if you have a product matching the above. If yes, please share.
1.	TDS (Technical Data Sheet)
2.	SDS (Safety Data Sheet)
3.	COA (Certificate of Analysis) of a recent batch
4.	FOB/CIF price for MOQ and standard packaging
5.	Sample availability for lab evaluation

Kindly include lead time, port of loading, and available grades.

We are evaluating this for long-term procurement and look forward to your prompt response.