Acid dyes price increase rapidly recently and inventory is not much. Especially the acidic black 194, 

prices rise of 2-Naphthol and 6-Nitro-1,2-diazooxy-4-naphthalene sulfonate lead to acid black M-SRL 

prices rose much. If there is a demand, please contact us as soon as possible. We will do a good job 

of production plans and reasonable shipping arrangement.