Just to add at least perhaps two possibilities:

https://books.google.at/books?isbn=1483164683 :

Richard W. Horobin - 2014

>  see Table34, p.117

or.... "Azo-dye coupling for tyrosine, tryptophan, and histidine (found on page -8- in: http://jcs.biologists.org/content/s3-100/49/1.full.pdf

Some Histochemical Observations on Amino-acids and Nucleic Acids in the Wool Follicle. By M. L. RYDER (1959)

Good luck!

(further possible references:  GOOGLEING:

<   Tyrosine+AND+staining+AND+HISTOCHEM  >

Thank you for your helpful comment Dr. Wolfgang.

Carlos, you are welcome.

A second look into my files resulted in finding the following (thanks to these old classical histochemists!) contained in

BANCROFT JD& GAMBLE M(Eds), 2008/2011:

Theory and Practice of Histological Techniques (Churchill-Livingstone/Elsevier)

MILLON reaction for tyrosine (BAKER 1956) 

.....a histochemical approach for NBF-(FA-vapour for Freeze Dried tissue) fixed tissues, to be used on Paraffin, fixed cryostat sections, freeze dried, or celloidin (embedded) sections: in brief:  Solution A: mercuric sulfate in hydrous solution acidified with sulfuric acid solution B: hydrous solution of sodium nitrite, A&B are mixed together (5 soln b, to 50 ml soln a), rel. short staining procedure (some 6-8 (with cooling perhaps 15 mins). Results: Tyrosine-containing proteins:  red or pink

Suitable control tissue: pancreas

Cave: hazardous waste solutions (mercury); Cave: dilution of concentrated H2SO4 in water.

The second method given: 

Diazotization-coupling method for tyrosine (GLENNER & LILLIE, 1959) , employing 8-amino-1-naphthol-5-sulfonic acid as a coupling amine for the diazonium nitrites produced by nitrozation of tyrosine. Prerequisiete: Incubatuion stages / reactions / staining: in the dark and at low temperature. As said, this method gives better and stronger rsults than the MILLON method. 

! Staining procedure TAT !:  approx. 26 h (total, including one incubation @ 4°C for 24h).

Hope this is perhaps better stuff than mentioned above in my first reply.... For today I am unfortunately unable to provide a methods-containing document (scan) for you.

Results: Tyrosine containing proteins:  purple and red.

Best wishes and regards, Wolfgang